J/A+A/397/997 Hipparcos red stars (Platais+, 2003)
Hipparcos red stars in the HpVT2 and VIC systems.
Platais I., Pourbaix D., Jorissen A., Makarov V.V., Berdnikov L.N.,
Samus N.N., Lloyd Evans T., Lebzelter T., Sperauskas J.
<Astron. Astrophys. 397, 997 (2003)>
=2003A&A...397..997P 2003A&A...397..997P
ADC_Keywords: Stars, late-type ; Photometry, UBVRI ; Photometry, Cousins ;
Radial velocities
Keywords: stars: late type - stars: carbon - photometry - radial velocities
Abstract:
For Hipparcos M, S, and C spectral type stars, we provide calibrated
instantaneous (epoch) Cousins V-I color indices using newly derived
HpVT2 photometry. Three new sets of ground-based Cousins VI data
have been obtained for more than 170 carbon and red M giants, observed
at SAAO in 1984 and 1987 (table1), at Siding Spring Observatory in
2002 (table2), and with the Automatic Photoelectric Telescopes located
at Fairborn Observatory from 1996 (table3).
These datasets in combination with the published sources of VI
photometry served to obtain the calibration curves linking
Hipparcos/Tycho Hp-VT2 with the Cousins V-I index. In total, 321
carbon stars and 4464 M- and S-type stars have new V-I indices. The
standard error of the mean V-I is about 0.1mag or better down to Hp∼9
although it deteriorates rapidly at fainter magnitudes. These V-I
indices can be used to verify the published Hipparcos V-I color
indices. Thus, we have identified a handful of new cases where,
instead of the real target, a random field star has been observed. A
considerable fraction of the DMSA/C and DMSA/V solutions for red stars
appear not to be warranted. Most likely such spurious solutions may
originate from usage of a heavily biased color in the astrometric
processing.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 59 85 SAAO photometry of selected carbon stars
table2.dat 45 47 BVI photometry at Siding Spring
table3.dat 45 45 APT photometry of selected red variables
table5.dat 48 61 Radial velocities of R and other selected
carbon stars
table7.dat 50 4785 Coefficients of the linear regression between
Hp-VT2 and Hp for each of the Hipparcos
M, S and C stars studied.
--------------------------------------------------------------------------------
See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- CGCS CGCS number (Cat. III/227)
5 A1 --- n_CGCS [a] a: close companion (1)
7- 12 I6 --- HIP ? HIP number
14- 22 A9 --- GCVS GCVS (variable) name
24- 28 F5.2 mag Vmag V magnitude
29 A1 --- n_Vmag [v] v: apparent variability
31- 34 F4.2 mag B-V B-V colour index
35 A1 --- n_B-V [v] v: apparent variability
36 A1 --- u_B-V Uncertainty flag on B-V
38- 41 F4.2 mag U-B U-B colour index
42 A1 --- n_U-B [v] v: apparent variability
43 A1 --- u_U-B Uncertainty flag on U-B
45- 48 F4.2 mag Rc-Ic ? Cousins R-I colour index
49 A1 --- n_Rc-Ic [v] v: apparent variability
51- 54 F4.2 mag V-Ic ? V-Ic colour index
55 A1 --- n_V-Ic [v] v: apparent variability
57 I1 --- o_Vmag Total number of observations
--------------------------------------------------------------------------------
Note (1): Close companion:
1871 (9" separation, bright)
3855 (15")
3864 (11")
3966 (15", bright)
4179 (14")
4524 (13" & 18")
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HIP HIP number
9- 17 A9 --- GCVS GCVS name
19- 29 F11.3 d JD Julian date
31- 35 F5.2 mag Vmag V magnitude
37- 40 F4.2 mag B-V B-V colour index
42- 45 F4.2 mag V-Ic V-Ic colour index
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HIP HIP number
9- 17 A9 --- GCVS GCVS name
20- 23 F4.2 mag Vmag V magnitude
26- 29 F4.2 mag V-Ic V-Ic colour index
31- 35 F5.2 --- a0 Fit coefficient a0 (intercept) (1)
37- 41 F5.3 --- a1 Fit coefficient a1 (slope) (1)
43- 45 I3 --- o_Vmag Total number of observations
--------------------------------------------------------------------------------
Note (1): V-Ic = a0 + a1Vmag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- HIP ? HIP number
8- 11 I4 --- CGCS ? CGCS number
14- 22 A9 --- GCVS GCVS name
24 A1 --- n_GCVS [a] a: Not HIP 29899. See Table 8 of paper
26- 36 F11.3 d JD Julian date
38- 43 F6.1 km/s HRV Heliocentric radial velocity
45- 47 F3.1 km/s e_HRV rms uncertainty on HRV
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HIP Hipparcos Catalogue number
8- 16 A9 --- Name GCVS variable star name or NSV suspected
variable number
19- 23 F5.2 mag Hpmag Hipparcos median Hp magnitude (H44)
26- 29 F4.2 mag e_Hpmag Amplitude of Hp variation, i.e., H50-H49
32- 36 F5.2 --- b0 Fit coefficient b0 (intercept) (1)
38- 42 F5.2 --- b1 Fit coefficient b1 (slope) (1)
44- 48 F5.2 mag V-I Median V-I color (derived in this paper)
50 A1 --- SpType Crude spectral type
--------------------------------------------------------------------------------
Note (1): Hp can be predicted for any VT2 via
Hp = (b0 + VT2)/(1 - b1)
--------------------------------------------------------------------------------
Acknowledgements: Dimitri Pourbaix
History:
* 04-Nov-2002: Catalog originalluCy received from Dimitri Pourbaix
* 23-Apr-2004: A completed table7, including the "V-I" column which
was not in the original version, was supplied by Alain Jorissen.
(End) Patricia Bauer [CDS] 04-Nov-2002