2008ApJ...672..590M


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.02CEST02:38:10

2008ApJ...672..590M - Astrophys. J., 672, 590-603 (2008/January-1)

The B and Be star population of NGC 3766.

McSWAIN M.V., HUANG W., GIES D.R., GRUNDSTROM E.D. and TOWNSEND R.H.D.

Abstract (from CDS):

We present multiple epochs of Hα spectroscopy for 47 members of the open cluster NGC 3766 to investigate the long-term variability of its Be stars. Sixteen of the stars in this sample are Be stars, including one new discovery. Of these, we observe an unprecedented 11 Be stars that undergo disk appearances and/or near disappearances in our Hα spectra, making this the most variable population of Be stars known to date. NGC 3766 is therefore an excellent location to study the formation mechanism of Be star disks. From blue optical spectra of 38 cluster members and existing Strömgren photometry of the cluster, we also measure rotational velocities, effective temperatures, and polar surface gravities to investigate the physical and evolutionary factors that may contribute to the Be phenomenon. Our analysis also provides improvements to the reddening and distance of NGC 3766, and we find E(B-V)=0.22±0.03 and (V-MV)0=11.6±0.2, respectively. The Be stars are not associated with a particular stage of main-sequence evolution, but they are a population of rapidly rotating stars with a velocity distribution generally consistent with rotation at 70%-80% of the critical velocity, although systematic effects probably underestimate the true rotational velocities, so that the rotation is much closer to critical. Our measurements of the changing disk sizes are consistent with the idea that transitory, nonradial pulsations contribute to the formation of these highly variable disks.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 3766 - Stars: Emission-Line, Be

Status at CDS:  

Simbad objects: 52

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Number of rows : 52

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 399 0
2 NAME Car Arm PoG 10 00 -60.0           ~ 377 1
3 * alf Leo PM* 10 08 22.31099 +11 58 01.9516 0.88 1.24 1.40 1.37 1.47 B8IVn 805 1
4 HD 306657 Be* 11 35 15.1700191813 -61 41 59.550147246   10.383 10.299 10.36   B2Ve 24 0
5 HD 306793 Be* 11 35 22.0704661040 -61 32 10.945621376   10.606 10.532 10.84   B3Vn 21 0
6 CPD-60 3083 * 11 35 35.8676953536 -61 35 00.762563431   10.364 10.342     B 8 0
7 CPD-60 3088 * 11 35 36.8863294091 -61 34 04.971462597   10.623 10.620     B 8 0
8 CPD-60 3089 * 11 35 37.1641304477 -61 41 09.710037920   11.910 11.811     ~ 3 0
9 Cl* NGC 3766 MG 129 * 11 35 41.1565174099 -61 37 32.559757035   12.447 12.364     B 4 0
10 HD 306785 * 11 35 48.5749352792 -61 29 19.182846944   9.671 9.663     B3 14 0
11 NGC 3766 253 * 11 35 50.8601769833 -61 41 56.505204650   12.245 12.145     B 5 0
12 HD 306795 * 11 35 51.9936762084 -61 39 39.678388223   10.689 10.671     A 13 0
13 CPD-60 3101 * 11 35 54.4254926667 -61 34 30.479243245   10.823 10.807     ~ 8 0
14 HD 100856 Be* 11 35 55.4592323756 -61 36 13.744784516 7.29 8.52 8.57 9.41   B2IVp(e) 39 0
15 CPD-60 3104 * 11 35 55.7373839130 -61 32 32.024680142   10.88 10.79     ~ 5 0
16 CPD-60 3108 Be* 11 36 01.1055717877 -61 37 18.493337151 9.45 10.05 10.05 10.60   B2Vnep 22 0
17 NGC 3766 4 * 11 36 01.9809658888 -61 35 38.153918075           Be 3 0
18 Cl* NGC 3766 MG 126 * 11 36 02.42 -61 37 26.4           B 3 0
19 HD 306794 * 11 36 04.5015350877 -61 35 22.743418424 8.03 8.03 8.11 9.03   OB 23 0
20 HD 306797 Be* 11 36 05.4838549502 -61 42 06.058548774 9.19 9.93 9.78 10.06   B5II 35 0
21 CPD-60 3122 Be* 11 36 08.0250089798 -61 38 38.205901816   10.04 10.00     B3nep_sh 22 0
22 CPD-60 3120 * 11 36 08.2503769986 -61 34 19.384965806   10.67 10.70     B4V 11 0
23 HD 306798 Be* 11 36 09.3688317648 -61 41 41.572799484 8.84 9.74 9.64 9.83   Be 32 0
24 CPD-60 3125 Be* 11 36 09.5642583289 -61 35 38.141324847 8.58 9.15 9.13 9.72   B2IVne 31 0
25 CPD-60 3126 Be* 11 36 10.1584463441 -61 37 39.882785987 8.66 9.27 9.26     B1.5Vn 31 0
26 NGC 3766 34 * 11 36 10.86 -61 36 38.8           B 3 0
27 CPD-60 3128 Be* 11 36 11.865192 -61 35 50.27604 7.78     9.27   B2IV-V 29 0
28 CPD-60 3131 * 11 36 12.0295331254 -61 35 10.632869627   11.3 11.3     B 8 0
29 CD-60 3626B * 11 36 12.5247103224 -61 32 40.221308003   9.5 9.4 10.50   B3Vn 16 0
30 CPD-60 3133 Pu* 11 36 14.0485730387 -61 37 35.685468309 9.46 9.948 9.885     B2Vp 22 0
31 CPD-60 3134 * 11 36 15.8723696546 -61 35 01.636383105 9.9 10.46 10.42     B2IV-V 12 0
32 V* BF Cen Al* 11 36 17.0350065550 -61 28 01.401506065   8.508 8.484   8.619 B8 38 0
33 NGC 3766 OpC 11 36 18 -61 36.9   5.66 5.3     ~ 184 0
34 CD-60 3629 * 11 36 21.1024549215 -61 39 03.332339259 8.45 9.004 8.982 9.64   B2IV-V 24 0
35 CPD-60 3147 * 11 36 21.3757524884 -61 35 15.017018962 9.2 9.48 9.43     B2IV-Vn 11 0
36 CPD-60 3149 Be* 11 36 21.8446717305 -61 36 29.849425918   10.36 10.33 10.71   B4Vne 11 0
37 CPD-60 3144 Be* 11 36 21.9356986487 -61 37 28.466937636   10.915 10.836     Be 11 0
38 NGC 3766 13 * 11 36 22.6884051862 -61 33 33.963277831   12.773 12.680     B 7 0
39 NGC 3766 233 * 11 36 29.9180278537 -61 39 47.161732130   12.545 12.433     B 4 0
40 HD 306791 Be* 11 36 31.5552738719 -61 34 25.731117578 8.03 8.507 8.429 9.35   B2III 38 0
41 NGC 3766 45 * 11 36 32.0975669142 -61 36 25.968547485   11.704 11.604     B 4 0
42 Cl* NGC 3766 MG 118 * 11 36 33.0806678911 -61 37 14.476989818   12.093 12.020     B 4 0
43 Cl* NGC 3766 MG 162 * 11 36 34.4676808957 -61 39 13.237570945   12.737 12.621     B 4 0
44 NGC 3766 218 * 11 36 36.0232371475 -61 39 57.945213284   11.930 11.851     B 4 0
45 CPD-60 3164 * 11 36 38.3984381120 -61 34 10.589589567   11.437 11.385     B 8 0
46 CPD-60 3166 * 11 36 40.81 -61 35 41.1 11.035 11.375 11.390     ~ 8 0
47 CPD-60 3165 Be* 11 36 41.8899355425 -61 37 53.799534331 10.665 11.106 11.020     Be 10 0
48 HD 100969 * 11 36 41.8927055911 -61 31 37.387646126 8.47 9.074 9.055     B2/5 20 0
49 Cl* NGC 3766 MG 155 * 11 36 46.0049843924 -61 38 37.765518833   12.512 12.388     B 5 0
50 NGC 3766 213 * 11 36 48.5144624707 -61 40 08.380705823   11.955 11.890     B 4 0
51 CPD-60 3174 * 11 36 49.3497444375 -61 36 21.024219816   11.045 10.977     B 12 0
52 Cl* NGC 3766 MG 23 * 11 36 56.3702961962 -61 32 08.657549310   12.903 12.798     ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.06.02-02:38:10

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