J/AJ/144/158 Properties of B and Be stars in h and χ Persei (Marsh+, 2012)
Physical properties of the B and Be star populations of h and χ Persei.
Marsh Boyer A.N., McSwain M.V., Aragona C., Ou-Yang B.
<Astron. J., 144, 158 (2012)>
=2012AJ....144..158M 2012AJ....144..158M
ADC_Keywords: Clusters, open ; Stars, B-type ; Stars, Be ; Stars, masses ;
Rotational velocities ; Effective temperatures
Keywords: open clusters and associations: individual (NGC 869,NGC 884) -
stars: emission-line, Be
Abstract:
We present a study of the B and Be star populations of the double
cluster h and χ Persei. Blue optical spectroscopy is used to first
measure projected rotational velocity, vsini, effective surface
temperature, Teff, and surface gravity, logg, for B-type sample
stars, while available Stromgren photometry is used to calculate
Teff and logg for the Be stars showing emission. In our sample of
104 objects for which we measured these stellar parameters, 28 are
known or proposed Be stars. Of these Be stars, 22 show evidence of
emission at the times of our observations, and furthermore, we find
evidence in our data and the literature for at least 8 transient Be
stars in the clusters. We find that the Be stars are not rotating near
their critical velocity, contrary to the results of studies of similar
open clusters. We compare the results of our analysis with other
previous studies and find that the cluster members are more evolved
than found by Huang & Gies but still retain much of their initial
rotational angular momentum.
Description:
We have obtained spectra for a total of 104 members of NGC 869
(h Persei) and NGC 884 (χ Persei) during multiple observing runs:
in 2005 November 14-15 (4250-4900Å, R=4700) using the Kitt Peak
National Observatory (KPNO) Wisconsin-Indiana-Yale NOAO (WIYN) 3.5m
telescope with the Hydra multifiber spectrograph, in 2010 August 23-27
(4000-5200Å, R=1600) and 2010 August 28-31 (5350-6810Å, R=4500)
using the Wyoming Infrared Observatory (WIRO) 2.3m telescope with the
Long Slit spectrograph, in 2011 November 10-13 (4000-5000Å, R=2300)
using the KPNO 2.1m telescope with the GoldCam spectrograph, and in
2012 January 3-8 (4090-4550Å, R=7800; and 6320-7025Å, R=11700)
using the 0.9m KPNO Coude Feed (CF) telescope with the Coude
spectrograph.
Objects:
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RA (2000) DE Designation(s)
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02 19 00 +57 07.7 NGC 869 = NAME h Per Cluster
02 22 23 +57 07.5 NGC 884 = NAME chi Per Cluster
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 83 76 Physical parameters of B-type cluster members
table3.dat 83 28 Physical parameters of Be star cluster members
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See also:
J/MNRAS/407/2109 : Kinematic study of open clusters (Vande Putte+, 2010)
J/ApJS/186/191 : VI photometry and spectroscopy in h+χ Per (Currie+, 2010)
J/ApJ/700/1216 : Spectroscopy of Be stars in open clusters (McSwain+, 2009)
J/AJ/137/3210 : Chandra observations of h Persei (Currie+, 2009)
J/ApJ/672/558 : MIPS observations of h and χ Persei (Currie+, 2008)
J/ApJ/659/599 : IRAC and JHKs photometry of h and chi Persei (Currie+, 2007)
J/ApJ/669/L33 : Hα emission sources in h and χ Per (Currie+, 2007)
J/ApJ/648/591 : Stellar rotation in young clusters. II. (Huang+, 2006)
J/ApJ/648/580 : Rotational velocities in 19 open clusters (Huang+, 2006)
J/AJ/129/809 : B-star rotational velocities in h+χ Persei (Strom+, 2005)
J/ApJ/576/880 : CCD UBV photometry of h and χ Per (Slesnick+, 2002)
J/A+A/394/479 : uvbyβ photometry of h and chi Per (Capilla+, 2002)
J/PASP/114/233 : h and χ Per memberships (Uribe+, 2002)
J/AJ/122/248 : h and chi Per UBVI,Hα photometry (Keller+, 2001)
J/A+A/372/477 : ubvyβ photometry of h + chi Persei (Marco+, 2001)
Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [NGC]
5- 7 I3 --- NGC [869/994] Cluster NGC number: 869(h)/894(χ)
9- 12 I4 --- WEBDA [49/2907] WEBDA number in cluster (1)
14 A1 --- r_WEBDA [abc] Reference for binarity (a, b, or c) (2)
16- 18 I3 km/s vsini ? Rotational velocity
20- 21 I2 km/s e_vsini ? Uncertainty in vsini
23- 27 I5 K Teff ? Effective surface temperature
29- 32 I4 K e_Teff ? Uncertainty in effective temperature
34- 37 F4.2 [cm/s2] logg ? Surface gravity
39- 42 F4.2 [cm/s2] e_logg ? Uncertainty in logg
44- 47 F4.2 [cm/s2] loggP ? Polar gravity (3)
49- 52 F4.1 Msun Mass ? Stellar mass
54- 56 F3.1 Msun e_Mass ? Error in stellar mass
58- 61 F4.1 Rsun Rad ? Stellar radius
63- 65 F3.1 Rsun e_Rad ? Error in stellar radius
67- 71 A5 --- Ref1 Reference for no emission observed (4)
73- 83 A11 --- Ref2 Reference for emission observed (4)
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Note (1): WEBDA database available at www.univie.ac.at/webda and maintained
by Ernst Paunzen.
Note (2): Source as follows:
a = proposed spectroscopic binary from Huang & Gies (2006, cat. J/ApJ/648/580);
b = proposed eclipsing binary from Saesen et al. (2010, cat. J/A+A/515/A16);
c = eclipsing binary from Southworth et al. (2004MNRAS.355..986S 2004MNRAS.355..986S).
Note (3): Converted from logg as detailed in Huang & Gies (2006,
cat. J/ApJ/648/591, section 3). See section 3 for more details.
Note (4): Reference as follows:
1 = Schild (1966ApJ...146..142S 1966ApJ...146..142S);
2 = Slettebak (1985ApJS...59..769S 1985ApJS...59..769S);
3 = Fabregat et al. (1994BeSN...29....8F 1994BeSN...29....8F);
4 = Keller et al. (2001, cat. J/AJ/122/248);
5 = Slesnick et al. (2002, cat. J/ApJ/576/880);
6 = Bragg & Kenyon (2002AJ....124.3289B 2002AJ....124.3289B);
7 = Be candidate with observed IR excesses in Currie et al. (2008,
Cat. J/ApJ/672/558);
8 = This work.
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History:
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(End) Sylvain Guehenneux [CDS] 16-Dec-2013