J/ApJS/161/118 byHα photometry in open clusters (McSwain+, 2005)
The evolutionary status of Be stars: results from a photometric study of
southern open clusters.
McSwain M.V., Gies D.R.
<Astrophys. J. Suppl. Ser., 161, 118-146 (2005)>
=2005ApJS..161..118M 2005ApJS..161..118M
ADC_Keywords: Clusters, open ; Stars, Be ; Stars, emission ; Photometry, uvby
Keywords: open clusters and associations: individual (Basel 1, Bochum 13,
Collinder 272, Haffner 16, Hogg 16, Hogg 22, IC 2395, IC 2581,
IC 2944, NGC 2343, NGC 2362, NGC 2367, NGC 2383, NGC 2384, NGC 2414,
NGC 2421, NGC 2439, NGC 2483, NGC 2489, NGC 2571, NGC 2659, NGC 3293,
NGC 3766, NGC 4103, NGC 4755, NGC 5281, NGC 5593, NGC 6178, NGC 6193,
NGC 6200, NGC 6204, NGC 6231, NGC 6249, NGC 6250, NGC 6268, NGC 6322,
NGC 6425, NGC 6530, NGC 6531, NGC 6604, NGC 6613, NGC 6664,
Ruprecht 79, Ruprecht 119, Ruprecht 127, Ruprecht 140, Stock 13,
Stock 14, Trumpler 7, Trumpler 18, Trumpler 20, Trumpler 27,
Trumpler 28, Trumpler 34, vdB-Hagen 217) - stars: emission-line, Be
Abstract:
Be stars are a class of rapidly rotating B stars with circumstellar
disks that cause Balmer and other line emission. There are three
possible reasons for the rapid rotation of Be stars: they may have
been born as rapid rotators, spun up by binary mass transfer, or spun
up during the main-sequence (MS) evolution of B stars. To test the
various formation scenarios, we have conducted a photometric survey of
55 open clusters in the southern sky. Of these, five clusters are
probably not physically associated groups and our results for two
other clusters are not reliable, but we identify 52 definite Be stars
and an additional 129 Be candidates in the remaining clusters.
Description:
We made photometric observations of the clusters over 14 nights
between 2002 March 27-April 2 and 2002 June 1925 with the CTIO (Cerro
Tololo Inter-American Observatory) 0.9m telescope and SITe 2048 CCD.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 17541 Photometry of selected stars in open clusters
table2.dat 70 55 Summary of open clusters
refs.dat 98 34 References
table4.dat 37 48 Distribution of open clusters
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See also:
J/ApJ/622/1052 : byHα photometry of NGC 3766 (McSwain+, 2005)
J/A+A/402/549 : UBVRIHα photometry of NGC 3293 (Baume+, 2003)
VII/229 : Optically visible open clusters and Candidates
(Dias+ 2002-2005)
J/A+A/373/153 : CCD Δa-photometry of 5 open clusters (Paunzen+, 2001)
J/A+A/360/529 : BVI photometry of 4 young open clusters (Piatti+, 2000)
J/A+A/370/931 : BVI photometry of 4 open clusters (Piatti+, 2001)
J/A+A/369/511 : Open star clusters. III. NGC 4103, 5281, 4755 (Sanner+, 2001)
J/A+AS/124/13 : UBVRI photometry of the cluster Collinder 272 (Vazquez+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name
15- 18 I4 --- MG Star identifying number (1)
20- 21 I2 h RAh Hour of Right ascension (J2000.0)
23- 24 I2 min RAm Minute of Right ascension (J2000.0)
26- 30 F5.2 s RAs Second of Right ascension (J2000.0)
32 A1 --- DE- Sign of the Declination (J2000.0)
33- 34 I2 deg DEd Degree of Declination (J2000.0)
36- 37 I2 arcmin DEm Arcminute of Declination (J2000.0)
39- 42 F4.1 arcsec DEs Arcsecond of Declination (J2000.0)
44- 49 F6.3 mag ymag Stromgren y magnitude
51- 55 F5.3 mag e_ymag 1σ error in ymag
57- 62 F6.3 mag b-y Stromgren b-y color index
64- 68 F5.3 mag e_b-y 1σ error in b-y
70- 75 F6.3 mag y-Ha y-Hα color index
77- 81 F5.3 mag e_y-Ha 1σ error in y-Ha
83- 85 A3 --- Code Code for type (2)
87- 93 I7 --- Webda ? The WEBDA identification number
95-114 A20 --- OName Other identification
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Note (1): Star identified as Cl* "Cluster" MG "MG",
Cl* VDBH 217 MG NNN for "vdB-Hagen 217" cluster.
Note (2): Code for type, defined as follows:
B = B-type star;
Be = definite Be star;
Be? = possible Be star;
O = other stars in the field;
F = probable foreground star.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name
14 A1 --- q_Cluster Reliability of cluster parameters (1)
16- 17 I2 h RAh Hour of Right Ascension (J2000.0)
19- 20 I2 min RAm Minute of Right Ascension (J2000.0)
22- 23 I2 s RAs Second of Right Ascension (J2000.0)
25 A1 --- DE- Sign of the Declination (J2000.0)
26- 27 I2 deg DEd Degree of Declination (J2000.0)
29- 30 I2 arcmin DEm Arcminute of Declination (J2000.0)
32- 33 I2 arcsec DEs Arcsecond of Declination (J2000.0)
35- 38 F4.2 mag E(b-y) Color excess
40- 44 F5.2 mag V0-MV Distance modulus
46- 49 F4.2 [yr] logAge Log of age
51 I1 --- Be Number of definite Be stars
53- 54 I2 --- Be? Number of possible Be stars
56 A1 --- l_B+Be [>] Lower limit flag on N(B*)
57- 59 I3 --- B+Be Number of B and Be stars identified
61- 70 A10 --- Ref References, detailed in refs.dat
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Note (1): Flag on Cluster, defined as follows:
a = Cluster parameters unreliable.
b = May not be a true cluster.
c = May contain PMS Herbig Be stars.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- Bibcode Bibcode
24- 42 A19 --- Aut Author's name
44- 98 A55 --- Com Comment
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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- 13 A13 --- Cluster Cluster name
15- 20 F6.2 deg GLON Galactic longitude
22- 26 F5.2 deg GLAT Galactic latitude
28- 31 F4.2 kpc Dist Distance to the Sun
33- 37 F5.2 kpc DistGC Distance to the Galactic Center
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History:
From electronic version of the journal
References:
McSwain & Gies, Paper I 2005ApJ...622.1052M 2005ApJ...622.1052M, Cat. J/ApJ/622/1052
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 12-Jul-2006