J/A+A/543/A125 Spectral types of CoRoT stars (Guenther+, 2012)
Multi-object spectroscopy of stars in the CoRoT fields.
II. The stellar population of the CoRoT fields IRa01, LRa01, LRa02, and LRa06.
Guenther E.W., Gandolfi D., Sebastian D., Deleuil M., Moutou C., Cusano F.
<Astron. Astrophys. 543, A125 (2012)>
=2012A&A...543A.125G 2012A&A...543A.125G
ADC_Keywords: Stars, late-type ; MK spectral classification
Keywords: catalogs - stars: late-type - stars: planetary systems -
stars: solar-type
Abstract:
In here we study the stellar content of the CoRoT-fields IRa01, LRa01
(=LRa06), and LRa02 by determining the spectral types of 11466 stars.
Nine planet host stars have already been identified in these fields.
The determination of the spectral types of thousands of stars of which
CoRoT obtained high-precision light-curves also opens up a large
variety of other research projects.
For our study, we used spectra obtained with the multi-object
spectrograph AAOmega and derived the spectral types by using template
spectra with well known parameters.
We find that 34.8±0.7% of the stars observed by CoRoT in these
fields are F-dwarfs, 15.1±0.5% G-dwarfs, and 5.0±0.3% K-dwarfs. We
conclude that the apparent lack of exoplanets of K- and M-stars is
explained by the relatively small number of these stars in the
observed sample. We also show that the apparently large number of
planets orbiting F-stars is also explained by the large number of such
stars in these fields. Given the number of F-stars, we would have
expected to find even more planet orbiting F-stars. Our study also
shows that the difference between the sample of stars that CoRoT
observes and a sample of randomly selected stars is relatively small,
and that the yield of CoRoT is the detection one hot Jupiter amongst
2100±700 stars.
We finally conclude that transit search programs can be used in order
to study the relation between the frequency of planets and the mass of
the host stars, and that the results obtained so far are in general
agreement with those of radial velocity programs.
Description:
Spectral types of late type stars in the CoRoT fields IRa01, LRa01,
LRa02, and LRa06.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 70 8516 Spectral types
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See also:
B/corot : CoRoT observation log Release 10 (CoRoT, 2012)
J/A+A/541/A34 : CoRoT-fields IRa01, LRa01, LRa02 stars SpType (Sebastian+ 2012)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- CoRoT CoRoT identification number (Cat. B/corot)
11- 18 F8.4 deg RAdeg Right ascension in decimal degrees (J2000.0)
20- 26 F7.4 deg DEdeg Declination in decimal degrees (J2000.0)
28- 33 F6.3 mag Vmag ?=0 V magnitude
35- 42 A8 --- SpType MK spectral type from AAOmega
44- 47 I4 K Teff ? Effective temperature from Gazzano et al.
(2010, Cat. J/A+A/523/A91)
49- 50 I2 K e_Teff ? rms uncertainty on Teff
52- 55 F4.2 [cm/s2] logg ? Surface gravity from Gazzano et al.
(2010, Cat. J/A+A/523/A91)
57- 60 F4.2 [cm/s2] e_logg ? rms uncertainty on logg
63- 70 A8 --- ExoName Exo-name, CoRoT- N (just for 2 stars
for which exoplanets were detected)
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Acknowledgements:
Eike W. Guenther, guenther(at)tls-tautenburg.de
References:
Sebastian et al., Paper I, 2012A&A...541A..34S 2012A&A...541A..34S, Cat. J/A+A/531/A34
(End) Eike W. Guenther [TLS Tautenburg], Patricia Vannier [CDS] 07-Jun-2012