2011A&A...533A..70H


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET22:28:24

2011A&A...533A..70H - Astronomy and Astrophysics, volume 533A, 70-70 (2011/9-1)

New β Cephei stars in the young open cluster NGC 637.

HANDLER G. and MEINGAST S.

Abstract (from CDS):

Studying stellar pulsations in open clusters offers the possibility of performing ensemble asteroseismology. The reasonable assumption that the cluster members have the same age, distance, and overall metallicity aids in the seismic modelling process and tightly constrains it. Therefore it is important to identify open clusters with many pulsators. New pulsating stars of the β Cephei type were searched for among the members of the open cluster NGC 637. Thirty-one hours of time-resolved V filter CCD photometry were obtained. The measurements confirmed two previously known variables, and revealed three new β Cephei stars and one more candidate. All four pulsators have sufficiently large amplitudes for easy mode identification and are multiperiodic. With four certain pulsating members, NGC 637 is now among the open clusters that are richest in β Cephei stars. It is thus an excellent target for ensemble asteroseismology, and to examine the differences between pulsating and apparently constant stars in the β Cephei domain.

Abstract Copyright:

Journal keyword(s): stars: early-type - open clusters and associations: general - techniques: photometric - stars: oscillations - asteroseismology

VizieR on-line data: <Available at CDS (J/A+A/533/A70): stars.dat v001.dat v003.dat v004.dat v006.dat v007.dat v013.dat v033.dat v068.dat v138.dat>

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 637 68 * 01 42 55.8135291104 +63 58 45.894235072   14.62 13.73 13.74 12.78 ~ 1 1
2 NGC 637 13 bC* 01 42 58.3385689419 +64 02 20.527659187   13.65 13.20     ~ 3 0
3 NGC 637 OpC 01 43 04 +64 02.4   8.56 8.2     ~ 68 0
4 LS I +63 160 bC* 01 43 04.0723104855 +64 01 26.695640873   10.73 10.47 10.357   B 12 0
5 NGC 637 137 * 01 43 04.1004309323 +64 02 22.188760511     10.787 10.87   ~ 4 0
6 LS I +63 161 * 01 43 04.2953112111 +64 02 13.339952556   10.473 10.168     OB+ 11 0
7 BD+63 226 bC* 01 43 07.1114647777 +64 04 09.938888514   10.32 10.07     B 13 0
8 LS I +63 163 bC* 01 43 08.9262535707 +64 02 29.557925222   11.04 10.70 10.725   B 13 0
9 NGC 637 33 bC* 01 43 09.9424945267 +64 02 12.964365309   13.64 13.20 13.49   ~ 2 0
10 LS I +63 166 bC* 01 43 32.1864087044 +64 02 15.268622312   10.80 10.61 10.613 10.63 OB- 15 0
11 V* V1143 Cas bC* 01 43 35.5790893649 +64 02 06.885209688   11.16 10.86 10.863 10.87 ~ 10 0
12 Cl* NGC 637 GRU 27 * ~ ~   14.18 13.63     ~ 2 0
13 Cl* NGC 637 GRU 18 * ~ ~   14.34 13.78     ~ 2 0

    Equat.    Gal    SGal    Ecl

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2021.02.24-22:28:24

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