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J/A+A/541/A34   Spectral types os stars in CoRoT fields       (Sebastian+, 2012)

Early-type stars in the CoRoT-fields IRa01, LRa01, LRa02. Sebastian D., Guenther E.W., Schaffenroth V., Gandolfi D., Geier S., Heber U., Deleuil M., Moutou C. <Astron. Astrophys. 541, A34 (2012)> =2012A&A...541A..34S
ADC_Keywords: Stars, early-type ; MK spectral classification Keywords: techniques: spectroscopic - planets and satellites: formation - surveys - stars: early-type - planets and satellites: detection Abstract: Observations of giant stars indicate that the frequency of giant planets is much higher for intermediate-mass stars than for solar-like stars. Up to now all known planets of giant stars orbit at relatively far distances from their host stars. It is not known whether intermediate-mass stars also had many close-in planets when they were on the main sequence, which were then engulfed when the star became a giant star. To understand the formation and evolution of planets it is therefore important to find out whether main-sequence stars of intermediate-mass have close-in planets or not. A survey for transiting planets of intermediate-mass stars would be ideal to solve this question, because the detection of transiting planets is not affected by the rapid rotation of these stars. With CoRoT it is possible to detect transiting planets around stars up to a spectral type B4V. As a first step for an efficient survey we need to identify intermediate-mass stars in the CoRoT-fields, which can then be used as an input list. To compile the input list we derived the spectral types of essentially all O, B and A stars down to 14.5mag in the CoRoT fields IRa01, LRa01, LRa02 taken with the multi-object spectrograph AAOmega. We determined the spectral types by comparing the spectra with template spectra from a library. In total we identify 1856 A and B stars that have been observed with CoRoT. Using multiple spectra of these stars, we find that the accuracy of the resulting spectral classification is 1.61±0.14 sub-classes for A and B stars. Given the number of planets that have been detected in these fields amongst late-type stars, we estimate that there are one to four transiting planets of intermediate-mass stars waiting to be discovered. Our survey not only allows us to carry out a dedicated planet search programme but is also essential for any types of studies of the light curves of early-type stars in the CoRoT database. We also show that it would be possible to extend the survey to all fields that CoRoT has observed using photometrically determined spectral types. Description: Spectroscopic classification for 2950 O-, B-, and A-type stars in the CoRoT-fields IRa01, LRa01, and LRa02. Stars are named by their CoRoT-identifier and Coordinates are given. The visual magnitudes were obtained with the Wide Field Camera filter-system of the Isaac Newton Telescope at Roque de los Muchachos Observatory on La Palma and can be converted into Landolt standards, as shown in Deleuil et al. (2009AJ....138..649D). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 44 2950 Spectral types for 2950 stars in the CoRoT-fields
See also: B/corot : CoRoT observation log Release 8 (CoRoT, 2012) J/A+A/482/L17 : CoRoT space mission. I. (Barge+, 2008) J/A+A/533/A4 : CoRoT photometry of three O-type stars (Blomme+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 I9 --- CoRoT CoRoT-Number of the star 11 A1 --- n_CoRoT [*] * if star was observed by CoRoT 13- 21 F9.5 deg RAdeg Right Ascension J2000 (degrees) 23- 30 F8.5 deg DEdeg Declination J2000 (degrees) 32- 36 F5.2 mag Vmag V-band magnitude of the star 38- 44 A7 --- SpType MK spectral type of the star
Acknowledgements: We are grateful to the user support group of AAT for all their help and assistance in preparing and carrying out the observations. We particularly thank Rob Sharp, Fred Watson and Quentin Parker. The authors thank DLR and the German BMBF for the support under grants 50 OW 0204, and 50 OW 0603 as well as DFG for the support of S. Geier through grant HE1356/49-1. Daniel Sebastian, sebastian(at)tls-tautenburg.de
(End) Daniel Sebastian [TLS, Tautenburg], Patricia Vannier [CDS] 12-Mar-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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