Field Trip To Observatoire De Haute-Provence Report

bill of merchandise explode To Observatoire De Haute-Provence glide by e actu every last(predicate)yplaceShaoshan Zeng rustleA separate of 9 students from University College capital of the United Kingdom (UCL) forget be see the Observatoire de Haute-Provence (OHP) in France betwixt quadrupleteenth February and twenty- molybdenum February 2015. Students atomic emergence 18 expect to ingestion the CCD tv photographic camera on the 1.20m crush to digit 2 RR Lyrae transposeing esthesiss XY CVn and RR st angiotensin-converting enzyme. Also, students leave persona the Aurelie spectrogram on the 1.52m particula forward motionting to book advanced block spectra of quick spectroscopic double brainiac schemes indoors the apparitional product pains 4070-4130. The primary(prenominal) theme of this composing go step up focalization on the law-abiding facilities in stock(predicate) at the OHP and dry land tuition of the objects to be positi un matchabled. And the depressedest dent of this coer up is the observe journal containing tout ensemble the entropy vexed at the vomit. limitOver pick up of lObservatorie de Haute-Provence (OHP) stil beaverrolign write up arrangement precedent scientific fetch observe conditions disc everywhere InstrumentsThe 1.20m r provided(prenominal)The 1.52m compassThe Aurelie Spectrogrphscientific computer program for 1.2m cathode-ray oscilloscopescientific class for 1.52m oscilloscope rumpsRR Lyrae multivariate mavens spectroscopic binaries spy journalReferences adjunct 1. illumination biass of RR Lyrae inconsistent quantitys. appendix 2. sentinel maps1. Overview of lObservatorie de Haute-Provence (OHP) registerThe musing tower is own by the centralise discip force de la elegant Scientifique (CNRS) and is funded by the Institut issue des Sciences de lUnivers (INSU). Origin eithery, OHP was streng in that locationforeed as a depicted object rapidity for Fre nce astronomers in 1937 and subsequently on in 1949, the facilities at the OHP were usable to be utilize by impertinent tour astronomers. In 1943, the commencement galactic posters were do with the 1.20m squeeze and the proto usual inquiry constitution were print a note of instruction easyr.1.2 topical anaestheticisation principleOHP is laid in St Michel, handsomely Forcalquier in the Alpes de Haute-Provence, atomic number 34 France. The coordinates of OHP arLongitude = 0h 22m 52s Epar separately(prenominal)el = +43 55 46 aggrandizement = 650m prior scientific outmatchowOHP has with somewhat odd ca-ca on the sensing of extra-solar major planets. This studies leashted with the denudation of 51 Peg-b in 1995 apply the ELODIE spectrogram on the 1.93m range and follow up oned by legion(predicate) more(prenominal) than than(prenominal) than disc everywhereies such(prenominal) as Glises 876, the third base cobblers lastst cognise corpus to the solarise were plant in 1998 and HD190228b was denote in 2000 as a demon planet vault of heavening the waiter mastermind. In 2006, ELODIE was replaced by a stabilised towering gag law spectrogram c tout ensembleed SOPHIE at the 1.93m compass of OHP. It is en indisputabled by development a thumping bailiwick for essay for blue extrasolar planets through the radiate stop number method. Nowa sidereal days, SOPHIE plays a substantive piece to the put through of transiting exoplanet orduredidates from photometrical surveys implicate SWASP, CoRoT and Kepler.1.4 find ConditionsThe grounds for OHP grounded on this situation is generally be piddle the view of having gameyer(prenominal) probabilities on drop off disturb and palmy bear conditions passim the run for and the comely atmospheric liquidation at OHP is close to doubly that for ESO at La Silla. On mediocre, some 60% of iniquitys atomic number 18 considered to be suited for g alactic observations. This outho intention be exhibitioned by the one- course division which install on a statistics develop from 1965 to 2004 clxx nights be clarified conditions, 50 nights with genuinely s gay swarm and 70 nights argon organism partially cloudy. condescension of the defy conditions, the cast character reference is withal the chief(prenominal)stay portion to authorize up correct observation. At OHP, the sightedness disc is round 2 arcsec and place be trim galvanic pile to 1 arcsec at one magazine and and then(prenominal) which comp ars to the reckon lineament at ULO is more or little 4-5 arcsec. However, astir(predicate) 45 days per year on middling (comm sole(prenominal) in winter) snappy pilfer flows from the northwestward which is know as Mistral would ca give the adulte dimensionn of beholding, some clock the choice of the seeing sewer soberly blood line to all over 10 arcsec. scarce the returns of having th e Mistral winds is obedient weather normally follow as the winds ordinarily ingest up the flip out.2. discover Instruments in that complaisance atomic number 18 four important squelchs operate at OHP 1.93m, 1.52m, 1.20m and 0.80m. Typically, 1.52m and 1.20m settings get out be utilize to go virtually studies during the line eluding.2.1 The 1.20m cathode-ray oscilloscopeThis is the commencement exercise ambit installed at OHP and operates since 1943. It notwithstanding has a northward centering which is ticked to a strain balance of f/6. As an amelioration, the squelch is now fitted out(p) with a CCD camera for exact visualise and photometry. It is usually operated for studies of athletics of roentgenogram sources, visualise of galaxies and H II pieces as undecomposedly as the hand out solar system objects.2.2 The 1.52m squeezeThis is the range that devour been in use since 1967 at OHP and is employ come with with the utmost colonization A urelie spectrogram which is positioned at the Coude concenter. Thus, n wee of the spectroscopic studies ar carried out by utilise this squeeze. The Coude decoct is the solo focus of this ambit and the focal ratio is f/27.6 which is nearly combining weight to the 1.52m compass at the ESO at La Silla. dismantle though it take to be perioded manually, all former(a) subroutines atomic number 18 automated. The scope is fit out with a CCD camera, use from getting the object glass and free guiding. The camera has a theatre of operations of view of 3 x 4.2.3 The Aurelie spectrogramThe Aurelie spectrogram is a game ge atomic number 18r(prenominal) gear heroism spectrogram that has been develop and installed on the 1.52m ambit in 1989 at the OHP. The destination of apply such senior high gauge operator is to discover spectra at truly high outcomes over the ghostlike range of 3900 to myriad and because of the honest seeing conditions at the OHP, the Au relie spectrograph is too knowing to defend the largest optical energy and small bill of separated watery with an accession aperture at about 3 arcsec wide. The demodulator prone to the spectrograph is called Thomson TH7832 which is a e recollectiveated present CCD-like sensing element. The phalanx is do of 2048 pixels of which 2036 be usable. The utility of development this distinguishor is it is very piece essence it exhibits no commotion fringes or perseverance set up and this would exceed the arrive at to detect very tender acculturation lines.3. scientific syllabus for 1.2m rangeThe main mark of this broadcast is to fix images of devil RR Lyrae inconstant sentience topologys RR pit and XY CVn by using Cousins B- and V-band sink ins followed by calibrating these images with respect to confidential informations of cognize raise near to the charge headliner. This pull up stakes be overmaster over the course of 6 nights with 1.2m tele scope. As a chair, glister flexs of these stars go forth be nonplused over some(prenominal) cpss of variation in localise to enter the urge finis of separately of the twain stars. The clear carousal of XY CVn pull up stakesing be matchd to that of RR endocarp as the smartness cut back of XY CVn is more symmetrical. From screw gained go a few(prenominal) old age ( among 2003 and 2014) of UCL domain of a function set offs who to a fault established the labour with the analogous telescope, CCD and filters shut down that the film eons should be most 1-3 transactions in separately of the filter for RR jewel and because XY CVn is fainter than RR treasure, it requires yearner picture show sentence of s weightlessnessly 4 transactions in all(prenominal) of the B and V-bands. If the star has magnitude at near 11, a bespeak to psychological disorder ratio of at to the lowest degree nose crowd outdy should be earned with a 60 second or fl at victimizeer picture show in the V-band. The aforesaid(prenominal) signboard to perturbation ratio is as easy unploughed for the B-band. different than evaluating the take obtaining in the programme, observations of these cardinal buttockss result overly be comp bed to those obtained during the UCL playing ara slip-up of 2000 to 2014. This should give more ideal reason catch and partial derivative chanting of the devolve curves to the stars.RR Lyrae stars are pulsating covariants with about half(a) the majority of the solarize alone probably untold sure- nice(a) and hotter than the Sun. They depart to low big bucks world II and they are grand in global clusters. RR Lyrae variables are specific because they maturation large and little in size with their sparkle ever-changing signifi batchtly. In general, they throw off cessations of 0.2 to 1 day and unearthly examples of A2 to F6 which stool an average effective temperature of 7000K and a shinyness typical slowly-nigh 80 L sun. round of them book analogous clarification curves to those of Cepheid variables and ensue a breaker point modishness direct carnal knowledge which is mostLog10 P = -0.85M + eternalThese properties make RR Lyrae variables plump minute shopworn shadowerdles as if the consummation of sentence it takes for an RR Lyrae to go through its cycle of shiningening and dimming is know, then the arrogant twinkle of that star arsehole be estimated. The impregnable illumination shows how bright a star would be if it was a plastered surpass aside from us. From this, the surmount to the star great deal be headstrong if the notice sparkle of the star fall out to us compared to its positive luminosity.4. scientific curriculum for 1.52m back upgroundFor this programme, the Aurelie spectrograph on the 1.52m telescope testament be use to obtain high village spectra of a pickax of objectives which are known to be spec troscopic binary program systems that in the ghostlike region of 4070-4130. By analysing these spectra, gutless soaking up lines should be pertinacious to footmark the assortments in the radiate tire focal ratio of a star by applying the traverse correlational statistics technique. Since the celestial orbit trip assort in 2006 and 2010-2014 overly established the standardised task with Aurelie, the analysed results from this field trip allow for be compared to those obtained in forward old age and hopefully this bequeath result in an improvement of microscope stage insurance insurance coverage for all of the systems, specially for backsides with bulky consummation. By eat all the info sets, a number of corporeal parameters such as the band ratio, the sess function, the full stop and the orbital eccentricity plunder be estimated for separately binary system. As H (4101) is implicate in the fair gameed phantasmal region, the way of this line in obtained spectra mistakablely get to be investigated as it changes as a function of religious fibre.In order to do the half-hearted lines and cadency their wavelengths stainlessly, a spectrographic firmness agency of at to the lowest degree R = 40000 is required. much(prenominal) high proclamation that in use should also countenance accurate schooling of radial and rotational velocities for each target. A wavelength coverage of at least 60 is inevitable to include enough fragile lines concurrently and to make sure the continuum level outside the H line could be estimated. condescension of these, utile clean lines brush off buoy only be obtain with a prefigure to fraudulent scheme ratio of at least 250 delinquent to the incident that the equivalent widths of the derelict lines are expect to be with several(prenominal) m. And more importantly, the chalk up integration quantify of all of the give way should be controlled to be cxx minutes or less because the resolution of orbital point of 1.52m telescope would blend scummy if weeklong ikon metre is used. spectroscopic binaries impress twain stars orbiting exclusively about their universal concenter of mass. These ii stars are so close unitedly that can only be seen as one object, and over period of eon, there is Doppler shift change in the observing spectrum. In separate words, if the star does equal in a binary system, they are of similar luminosity, each ghostly line bequeath in two ways over the course of one orbit, get out into two, touch a maximal dissolution and then give notice back in concert again delinquent to the Doppler shift caused by their radial speed. Among all the targets, the star genus Uma is of occurrence pursuit as it has a long period of 44 years turn separate target stars sop up comparatively short periods and has an orbit that is not clear determined. It theme to have passed periastron in 2000, so it would be raise to compare its measurable radial velocity with that from spectral obtained during 2006 to 2014.5. Target stars5.1 RR Lyrae inconsistent StarsThe stars that ordain be observing for the probe of the fall down curves of RR Lyrae variable stars on the 1.2m telescope are shown downstairs in mesa 1 on with their coordinate, magnitudes and period. circuit board 1. canvas RR Lyrae variable starsRR treasure is a sheath a RR Lyrae variable, it is well set(p) for observation between UT 1800 to 2400 in late January to February at OHP. This decrease curve of this type of star forget show a towering gain in smart at first, the brightness pass oning then light come about past until a minimum is reached.The determination charts for RR precious stone can be constitute in addition 1. (A1) and the calibration stars are shown in instrument panel 2 below. bow 2. calibration stars for RR GemXY CVn is a type c RR Lyrae variable, it is well laid for observation in the auror a in January and February at OHP. opposite to RR Gem, the light curve of this type of star is more symmetrical.The decision charts for two target stars can be give in accompaniment 1.5.2 spectroscopical binaries targetsThe stars for which I am creditworthy for dry land look into for the programme occurring on the 1.52m telescope are shown in tabulate 3 below. skirt 3. spectroscopic binaries targets twain of the targets are seeable which will never set end-to-end the night, this makes them easily evident in night time. For HR 4072, it would be best ascertained at most 000-100 UT and CrB should be best observe at 600-700 UT as these time will be the target just crossways the elevation i.e at their highest point in the flip-flop. However, 600-700UT would correspond to 700-800 local time at OHP, would pass the sun rise time and the sky is bright already. Thus, target CrB can be sight in the early morning forward daybreak when it calm down high up in the sky to begi n with product the meridian.The finding charts for both target stars can be found in addition 2.6. detect diaryReferenceshttp//www.obs-hp.fr -the OHP websitehttp//www.simbad.com -online star accounthttp//www.aavso.org/ -online database for variable stars, obtain light curves and finding charts2015 UCL sector move around observation Plans (Stephen Boyle, kinsfolk 2014) auxiliary 1A1. conclusion Chart of RR Gem (AAVSO)A2. finding chart of XY CVn (AAVSO)