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J/PAZh/37/769       Tycho-2 red giant branch and carbon stars (Gontcharov, 2011)

Red giant branch and carbon stars in the Tycho-2 Catalogue. Gontcharov G.A. <Pis'ma Astron. Zh. 37, 769 (2011)> =2011PAZh...37..769G (SIMBAD/NED BibCode) =2011AstL...37..707G
ADC_Keywords: Proper motions ; Stellar distribution ; Stars, distances ; Stars, giant Keywords: Galaxy (Milky Way) - spiral arms - stellar classification - types of stars - color-magnitude diagram - open clusters and associations: individual (Gould Belt) Abstract: Based on multicolor photometry from the 2MASS and Tycho-2 catalogues, we have produced a sample of 38368 branch red giants that has less than 1% of admixtures and is complete within 500 pc of the Sun. The sample includes 30671 K giants, 7544 M giants,49 C giants, and 104 suspected supergiants or S stars. The photometric distances have been calculated for K, M, and C stars with an accuracy of 40% together with reddening and extinction estimates. Tycho-2 proper motions and PCRV radial velocities are used to analyze the stellar kinematics. The majority of the selected K and M giants are disk stars with ages of more than 3Gyr. A small number of K and M giants are extremely young or, conversely, thick-disk ones. The spatial distribution and kinematics of the selected C stars force us to consider them as asymptotic branch giants with masses of more than 2 solar masses and ages of less than 2Gyr probably associated with the Gould Belt. The offset of the Sun above the Galactic equator has been found from the distribution of stars to be 13±2pc, which coincides with the previously obtained value for the clump red giants. Description: Our study showed that the broadband multicolor photometry from the 2MASS and Tycho-2 catalogues is enough to produce a pure (with an admixture of less than 1%) sample of RGB stars complete within 500pc of the Sun, to classify the sample stars into types K, M, and C, suspected supergiants, and S stars, to calculate the interstellar extinction, and to determine the photometric distances of K, M, and C stars with an accuracy of 40%. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table.dat 106 38368 Branch giants in Tycho-2 catalogue
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) III/231 : The Tycho-2 Spectral Type Catalog (Wright+, 2003) J/PAZh/34/868 : Red giant clump in the Tycho-2 catalogue (Gontcharov, 2008) Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 4 I4 --- TYC1 TYC1 from Tycho-2 (Cat. I/259) (1) 6- 10 I5 --- TYC2 TYC2 from Tycho-2 (Cat. I/259) (1) 11- 19 F9.4 deg RAdeg Right ascension in decimal degrees (J2000.0) 20- 28 F9.4 deg DEdeg Declination in decimal degrees (J2000.0) 30- 35 I6 --- HIP ? HIP (Cat. I/239) number 36- 44 F9.4 deg GLON Galactic longitude 45- 53 F9.4 deg GLAT Galactic latitude 54- 60 F7.3 mag BTmag [3.790,11.699] Tycho-2 BT magnitude 61- 66 F6.3 mag e_BTmag [0.014,0.158] Error on BTmag 67- 73 F7.3 mag VTmag [2.052,10.477] Tycho-2 VT magnitude 74- 79 F6.3 mag e_VTmag [0.009,0.057] Error on VTmag 80- 86 F7.3 mag VMAG [-1.473,2.890] Absolute magnitude (2) 87- 93 F7.3 mag AVc [-0.402,3.148] Interstellar extinction (2) 94- 98 I5 pc Dist [19,1438] Photometric distance (2) 99-104 F6.3 mag (B-V)0 [1.280,4.196] Dereddened (B-V) (2) 106 A1 --- Class [K,M,I,C] Class (3)
Note (1): The TYC1 is the GSC region number, TYC2 is the running number within the region, the TYC component identifier is always 1 for these stars and is not provided. TYC1 and TYC2 are copied from Tycho-2. Note (2): Absolute magnitude, interstellar extinction, photometric distance and dereddened (B-V) are calculated in this paper from photometry for K and M class and from the 3D extinction model by Gontcharov (2009AstL...35..780G) for C and I class. For I class they can be very uncertain. Note (3): The stars are separated in this paper into K and M giants, carbon stars (class C) and I class meaning supergiants and S-stars together.
Acknowledgements: George Gontcharov, georgegontcharov(at)
(End) George Gontcharov [Pulkovo Obs.], Patricia Vannier [CDS] 12-Jun-2017
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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