J/ApJS/168/277 HK-Survey field horizontal-branch candidates (Beers+, 2007)
A catalog of candidate field horizontal-branch and A-type stars.
III. A 2MASS-cleaned version.
Beers T.C., Almeida T., Rossi S., Wilhelm R., Marsteller B.
<Astrophys. J. Suppl. Ser., 168, 277-288 (2007)>
=2007ApJS..168..277B 2007ApJS..168..277B
ADC_Keywords: Stars, A-type ; Stars, horizontal branch
Keywords: stars: horizontal-branch
Abstract:
We present coordinates and available photometric information (either
from previous or recent broadband UBV observations, and near-infrared
photometry from the 2MASS Point Source Catalog) for 12,056 stars
(11,516 of which are unique) identified in the HK Survey of Beers and
colleagues as candidate field horizontal-branch or A-type stars. These
stars, in the apparent magnitude range 10≤B≤16.0, were selected
using an objective-prism/interference-filter survey technique. The
availability of 2MASS information permits assembly of a cleaned
version of this catalog, comprising likely blue horizontal-branch
(BHB) stars or blue stragglers in the color interval
[-0.2≤(B-V)0≤+0.2].
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 116 12057 Catalog of HK-Survey field horizontal-branch
candidates
table4.dat 92 12057 2MASS identifications of HK-Survey field horizontal-
branch candidates and multiple identifications
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See also:
J/ApJS/103/433 : Horizontal-branch and A-type star catalog. II (Beers+ 1996)
J/AJ/117/2308 : Spectroscopy of hot stars in the halo (Wilhelm+, 1999)
J/AJ/117/2329 : Spectroscopy of hot stars in the halo. III (Wilhelm+, 1999)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- BPS Star name (BPS BS FFFFF-NNNN
or BPS CS FFFFF-NNNN in Simbad)
13 A1 --- n_BPS [*] Indicates data added by the CDS team (1)
14 I1 --- BC ? Brightness classification (2)
16- 17 I2 h RAh Hour of Right Ascension (J2000)
19- 20 I2 min RAm Minute of Right Ascension (J2000)
22- 25 F4.1 s RAs Second of Right Ascension (J2000)
27 A1 --- DE- Sign of the Declination (J2000)
28- 29 I2 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 35 I2 arcsec DEs Arcsecond of Declination (J2000)
37- 41 F5.1 deg GLON Galactic longitude
43- 47 F5.1 deg GLAT Galactic latitude
49- 53 F5.2 mag Vmag ? Measured V band magnitude
55- 59 F5.2 mag B-V ? Measured (B-V) color index
61- 65 F5.3 mag E(B-V) ? Adopted reddening estimate
67- 72 F6.3 mag Jmag ? 2MASS J band magnitude
74- 79 F6.3 mag J-H ? 2MASS (J-H) color index
81- 86 F6.3 mag V0mag ? Extinction-corrected V band magnitude
88- 93 F6.3 mag V0mag2 ? Predicted 2MASS extinction-corrected
V band magnitude
95-100 F6.3 mag (B-V)0 ? Reddening-corrected (B-V) color index
102-107 F6.3 mag (B-V)02 ? Predicted 2MASS reddening-corrected
(B-V) color index
109-110 A2 --- q_Class BHB probability classification (3)
112-116 A5 --- Class Wilhelm et al. (1999, Cat. J/AJ/117/2329)
classification (4)
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Note (1): BPS CS 30339-015 is not part of the original table, but was added
by the CDS team so that tables 3 and 4 have the same number of
entries. Data were taken both from 2MASS and from Simbad.
Note (2): From visual inspection of the HK survey plates (1=brightest)
Note (3): The BHB (Blue Horizontal Branch) likelihood is assigned in the
following manner:
H = (high) star has either a measured or estimated (B-V)0 color in the
range -0.2≤(B-V)0≤+0.2;
M = (medium) star has either a measured or estimated (B-V)0 color in the
range -0.3≤(B-V)0←0.2 or +0.2<(B-V)0≤+0.4;
L = (low) star has either a measured or estimated (B-V)0 color in the
range lying outside of -0.3≤(B-V)0≤+0.4.
Stars where there remained some difficulty in either assigning a
confident 2MASS match, or where the 2MASS flags indicated possible
problems with the photometry, are indicated by the ":" attached to the
probability classification. Stars for which no suitable match in 2MASS
could be found are assigned an "X" for their probability
classifications.
Note (4): Classification, defined as follows:
FHB = the star has a derived temperature and gravity consistent with a
horizontal-branch identification;
FHB/A = it was not possible, based on the data in hand, to differentiate
between a horizontal-branch and a high-gravity A-type star
identification;
A-V = the star is a likely high-gravity object (note that this includes
some stars with temperatures cooler than would usually be considered
for assignment of a type A designation);
Am = the star is a likely metallic-line A-type star. The interested reader
should consult Wilhelm et al. (1999, Cat. J/AJ/117/2308) for a more
detailed discussion of these classes.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- BPS Star name
14- 29 A16 --- 2MASS The 2MASS Identification (HHMMSSss+DDMMSSs,
2MASS JHHMMSSss+DDMMSSs in Simbad)
31- 32 I2 h RA2h ? Hour of Right Ascension (J2000)
34- 35 I2 min RA2m ? Minute of Right Ascension (J2000)
37- 41 F5.2 s RA2s ? Second of Right Ascension (J2000)
43 A1 --- DE2- Sign of the Declination (J2000)
44- 45 I2 deg DE2d ? Degree of Declination (J2000)
47- 48 I2 arcmin DE2m ? Arcminute of Declination (J2000)
50- 53 F4.1 arcsec DE2s ? Arcsecond of Declination (J2000)
55- 92 A38 --- MID Multiple HK-survey Identification(s) (1)
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Note (1): Note that some of these multiply-identified stars are not present
in the FHB/A candidate catalog, since they were not classified as such
in the HK survey.
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History:
* 11-Dec-2008: From electronic version of the journal
* 13-Oct-2009: BPS CS 30339-015 was the only object to be present only in
table4 so the CDS team added it to table 3.
References:
Beers et al., Paper I 1988ApJS...67..461B 1988ApJS...67..461B
Beers et al., Paper II 1996ApJS..103..433B 1996ApJS..103..433B, Cat. J/ApJS/103/433
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 11-Dec-2008