J/PAZh/34/868 Red giant clump in the Tycho-2 catalog (Gontcharov, 2008)
Red giant clump in the Tycho-2 catalogue.
Gontcharov G.A.
<Pis'ma Astron. Zh. 34, 868 (2008)>
=2008PAZh...34..868G 2008PAZh...34..868G
=2008AstL...34..785G 2008AstL...34..785G
ADC_Keywords: Proper motions ; Stellar distribution ; Stars, distances ;
Stars, giant ; Stars, horizontal branch
Keywords: Galaxy (Milky Way) - spiral arms - stellar classification -
types of stars - color-magnitude diagram -
open clusters and associations: individual (Gould Belt)
Abstract:
The Tycho-2 proper motions and Tycho-2 and 2MASS photometry are used
to select 97348 red giant clump (RGC) stars. The interstellar
extinction and photometric distance are calculated for each of the
stars. The selected stars are shown to form a selection-unbiased
sample of RGC stars within about 350 pc of the Sun with the addition
of more distant stars. The distribution of the selected stars in space
and their motion are consistent with the assumption that the RGC
contains Galactic disk stars with various ages and metallicities,
including a significant fraction of stars younger than 1Gyr with
masses of more than 2 solar masses. These young stars show differences
of their statistical characteristics from those of older RGC stars,
including differences in the variations of their distribution density
with distance from the Galactic plane and in the dispersion of their
velocities found using radial velocities and proper motions. The Sun
has been found to rise above the Galactic plane by 13±1pc. The
distribution density of the stars under consideration in space is
probably determined by the Local Spiral Arm and the distribution of
absorbing matter in the plane of the Gould Belt. Data are also
available at: http://www.geocities.com/orionspiral/
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 233 97348 Clump red giants in Tycho-2 catalogue
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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)
III/252 : Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- TYC1 TYC1 from TYC (1)
6- 10 I5 --- TYC2 TYC2 from TYC (1)
11- 20 F10.6 deg RAdeg Right ascension in decimal degrees (J2000.0)
21- 30 F10.6 deg DEdeg Declination in decimal degrees (J2000.0)
31- 36 I6 --- HIP ? HIP (Cat. I/239) number
37- 42 F6.1 mas/a pmRA [-611.8,760.3] Proper motion in RA*cos(dec)
43- 48 F6.1 mas/a pmDE [-648.0,330.3] Proper motion in Dec
50- 52 F3.1 mas/a e_pmRA [0.3,4.8] Standard error in pmRA
54- 56 F3.1 mas/a e_pmDE [0.3,3.9] Standard error in pmDE
58- 67 F10.6 deg GLON Galactic longitude
68- 77 F10.6 deg GLAT Galactic latitude
78- 83 F6.1 mas/a pml [-655.7,686.7] Proper motion in GLON*cos(GLAT)
84- 89 F6.1 mas/a pmb [-425.1,310.9] Proper motion in GLAT
90- 94 F5.1 mas/a pm [0.0,760.6] Total proper motion
95- 98 F4.1 mas Plx ? Trigonometric parallax from HIP
99-101 F3.1 mas e_Plx ? Standard error in Plx
102-107 F6.1 km/s HRV [-278.2,148.8]? Radial velocity (2)
108-110 F3.1 km/s e_HRV [0.1,7.2]? HRV error
111-114 F4.2 mag AV [-0.02,4.55]? Interstellar extinction AV (3)
115-119 F5.2 mag BTmag [3.36,12.94] Tycho-2 BT magnitude
120-124 F5.2 mag e_BTmag [0.01,0.14] Error on BTmag
125-129 F5.2 mag VTmag [2.16,11.58] Tycho-2 VT magnitude
130-134 F5.2 mag e_VTmag [0.01,0.08] Error on VTmag
135-139 F5.2 mag Jmag [0.40,9.92] 2MASS J magnitude
140-144 F5.2 mag e_Jmag [0.02,8.89] Error on 2MASS J magnitude
145-149 F5.2 mag Hmag [-0.25,9.54]? 2MASS H magnitude
150-154 F5.2 mag e_Hmag [0.00,10.00]? Error on 2MASS H magnitude
155-159 F5.2 mag Kmag [-0.39,9.44] 2MASS Ks magnitude
160-164 F5.2 mag e_Kmag [0.01,8.89] Error on 2MASS Ks magnitude
165-176 A12 --- SpTyp.H ? Spectral type from HIP
177-186 A10 --- SpTyp.T ? Spectral Type from TST (Cat. III/231)
187 A1 --- TC ? Temperature class from TST
188 I1 --- SC [0,9]? Temperature Subclass from TST
189 I1 --- LC [1,5]? Luminosity class from TST
190-194 I5 K Teff [2600,22000]? Effective temperature from TST
195-199 F5.2 mag AVc [-0.34,1.33] Interstellar extinction (4)
201-204 F4.2 mag (B-V)0 [0.75,1.20] Dereddened (B-V) (5)
205-208 I4 pc Dist [19,1568] Photometric distance (6)
209-213 I5 pc X [-1203,1225] X rectangular galactic
coordinate (7)
214-218 I5 pc Y [-1463,1410] Y rectangular galactic
coordinate (7)
219-223 I5 pc Z [-1420,1237] Z rectangular galactic
coordinate (7)
225-228 F4.2 --- Sel1 [0.01,7.13] Selection parameter #1 (8)
230-233 F4.2 --- Sel2 [0.00,8.71] Selection parameter #2 (9)
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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): The heliocentric radial velocity taken from III/252, Pulkovo
radial velocities for 35493 HIP stars (Gontcharov, 2006)
Note (3): Interstellar extinction by Arenou et al. (1992A&A...258..104A 1992A&A...258..104A).
Note (4): Interstellar extinction calculated in this paper from photometry.
Note (5): Dereddened (B-V) calculated in this paper from photometry.
Note (6): Photometric distance calculated in this paper from photometry.
Note (7): Rectangular galactic coordinates X to the galactic centre, Y to
the direction of galactic rotation and Z to the northern galactic pole
calculated in this paper from photometry.
Note (8): Selection parameter # 1 is the offset of the star from the centre
of the distribution of the young RGC stars on the diagram
"(B-V)0 - reduced proper motion" (see paper for details).
Note (9): Selection parameter # 2 is the offset of the star from the centre
of the distribution of the old RGC stars on the diagram
"(B-V)0 - reduced proper motion" (see paper for details).
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Acknowledgements:
George Gontcharov, georgegontcharov(at)yahoo.com
(End) George Gontcharov [Pulkovo Obs.], Patricia Vannier [CDS] 07-Nov-2008