2016A&A...595L...1M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST11:57:27

2016A&A...595L...1M - Astronomy and Astrophysics, volume 595, L1-1 (2016/11-1)

Stellar variability in open clusters. II. Discovery of a new period-luminosity relation in a class of fast-rotating pulsating stars in NGC 3766.

MOWLAVI N., SAESEN S., SEMAAN T., EGGENBERGER P., BARBLAN F., EYER L., EKSTROM S. and GEORGY C.

Abstract (from CDS):

Context. Pulsating stars are windows to the physics of stars enabling us to see glimpses of their interior. Not all stars pulsate, however. On the main sequence, pulsating stars form an almost continuous sequence in brightness, except for a magnitude range between δ Scuti and slowly pulsating B stars. Against all expectations, 36 periodic variables were discovered in 2013 in this luminosity range in the open cluster NGC 3766, the origins of which was a mystery.
Aims. We investigate the properties of those new variability class candidates in relation to their stellar rotation rates and stellar multiplicity.
Methods. We took multi-epoch spectra over three consecutive nights using ESO's Very Large Telescope.
Results. We find that the majority of the new variability class candidates are fast-rotating pulsators that obey a new period-luminosity relation. We argue that the new relation discovered here has a different physical origin to the period-luminosity relations observed for Cepheids.
Conclusions. We anticipate that our discovery will boost the relatively new field of stellar pulsation in fast-rotating stars, will open new doors for asteroseismology, and will potentially offer a new tool to estimate stellar ages or cosmic distances.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: variables: general - stars: oscillations - stars: rotation - open clusters and associations: individual: NGC 3766

CDS comments: Table C.1 Some objects ([MBS2013] 51,66,10,107,154,364) are not in SIMBAD.

Simbad objects: 31

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Number of rows : 31

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9760 1
2 Cl* NGC 3766 MG 150 * 11 35 31.3405675162 -61 38 24.477070620   12.652 12.520     ~ 5 0
3 CPD-60 3093 * 11 35 44.0707648772 -61 36 04.428780398   11.718 11.660     ~ 8 0
4 NGC 3766 127 * 11 35 44.8956979561 -61 35 05.024678805   12.659 12.897     ~ 5 0
5 [YSS2013] 576 * 11 35 50.4115752826 -61 42 04.968039102   13.747 13.573     ~ 3 0
6 CPD-60 3105 * 11 35 57.0263851597 -61 38 15.657310787   11.289 11.222     ~ 4 0
7 NGC 3766 139 * 11 36 00.0458310636 -61 34 27.072657119 12.059 12.206 12.198     ~ 4 0
8 NGC 3766 89 * 11 36 05.4425974041 -61 38 48.820513093 13.126 12.990 12.895     ~ 4 0
9 CPD-60 3118 * 11 36 05.8492951526 -61 37 51.423755607 11.134 11.478 11.488     ~ 6 0
10 Cl* NGC 3766 MG 91 * 11 36 06.9586917451 -61 36 12.687605157 13.101 12.975 12.918     ~ 4 0
11 NGC 3766 32 * 11 36 09.0750027449 -61 36 33.371601276 12.368 12.140 12.137     ~ 4 0
12 CPD-60 3130 * 11 36 11.0720343154 -61 38 28.603322333 10.846 11.267 11.280     ~ 4 0
13 [MBS2013] 175 V* 11 36 11.9167326057 -61 34 23.835711690 13.120 13.013 12.955     ~ 3 0
14 Cl* NGC 3766 MG 68 * 11 36 15.1927771176 -61 35 22.490552029   12.165 12.096     ~ 5 0
15 Cl* NGC 3766 MG 11 * 11 36 15.8142622561 -61 30 50.292697268   11.846 11.758     ~ 6 0
16 NGC 3766 OpC 11 36 18 -61 36.9   5.66 5.3     ~ 188 0
17 [YSS2013] 1640 * 11 36 19.20 -61 30 49.0   13.947 13.731     ~ 3 0
18 [YSS2013] 1178 * 11 36 20.4272243736 -61 36 09.147492418   13.228 13.111     ~ 3 0
19 Cl* NGC 3766 MG 195 * 11 36 21.0918738424 -61 41 40.696154190   12.927 12.750     ~ 5 0
20 NGC 3766 13 * 11 36 22.6884051862 -61 33 33.963277831   12.773 12.680     B 7 0
21 NGC 3766 42 * 11 36 25.5755843686 -61 36 26.190301561   12.012 11.915     ~ 5 0
22 NGC 3766 51 * 11 36 25.9672205788 -61 37 19.107062397   12.860 12.751     ~ 6 0
23 CPD-60 3154 * 11 36 26.3601460688 -61 35 36.882946359 11.221 11.540 11.557     ~ 4 0
24 Cl* NGC 3766 MG 90 * 11 36 26.8518062644 -61 36 10.700033597   11.760 11.686     ~ 5 0
25 NGC 3766 17 * 11 36 29.5732436958 -61 35 14.059598462   12.971 12.847     ~ 6 0
26 NGC 3766 217 * 11 36 34.2643632312 -61 39 49.895072896   12.813 12.627     ~ 5 0
27 NGC 3766 214 * 11 36 37.7255955341 -61 39 23.479184227   12.606 12.510     ~ 5 0
28 CPD-60 3167 * 11 36 40.4398669527 -61 34 22.810376742   11.547 11.467     B 6 0
29 CPD-60 3166 * 11 36 40.81 -61 35 41.1 11.035 11.375 11.390     ~ 8 0
30 CPD-60 3165 Be* 11 36 41.8899355425 -61 37 53.799534331 10.665 11.106 11.020     Be 10 0
31 [YSS2013] 1491 * 11 36 45.1002856059 -61 32 27.964202640   13.528 13.384     ~ 4 0

    Equat.    Gal    SGal    Ecl

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2021.04.18-11:57:27

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