2011A&A...529A.137L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST13:09:02

2011A&A...529A.137L - Astronomy and Astrophysics, volume 529A, 137-137 (2011/5-1)

Long period variables and mass loss in the globular clusters NGC 362 and NGC 2808.

LEBZELTER T. and WOOD P.R.

Abstract (from CDS):

The pulsation periods of long period variables (LPVs) depend on their mass and helium abundance as well as on their luminosity and metal abundance. Comparison of the observed periods of LPVs in globular clusters with models is capable of revealing the amount of mass lost on the giant branch and the helium abundance. We aim to determine the amount of mass loss that has occurred on the giant branches of the low metallicity globular clusters NGC 362 and NGC 2808. We also aim to see if the LPVs in NGC 2808 can tell us about helium abundance variations in this cluster. We have used optical monitoring of NGC 362 and NGC 2808 to determine periods for the LPVs in these clusters. We have made linear pulsation models for the pulsating stars in these clusters taking into account variations in mass and helium abundance. Reliable periods have been determined for 11 LPVs in NGC 362 and 15 LPVs in NGC 2808. Comparison of the observed variables with models in the logP-K diagram shows that mass loss of ∼0.15-0.2M is required on the first giant branch in these clusters, in agreement with estimates from other methods. In NGC 2808, there is evidence that a high helium abundance of Y∼0.4 is required to explain the periods of several of the LPVs. It would be interesting to determine periods for LPVs in other Galactic globular clusters where a helium abundance variation is suspected to see if the completely independent test for a high helium abundance provided by the LPVs can confirm the high helium abundance estimates.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - globular clusters: individual: NGC 362 - globular clusters: individual: NGC 2808 - stars: mass-loss - stars: variables: general

Nomenclature: Table 2: [LW2011] NGC 362 LWNN (Nos LW1-LW13). Table 3: [LW2011] NGC 2808 LWNN (Nos LW1-LW20).

Simbad objects: 46

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Number of rows : 46

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3547 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 918 0
4 2MASS J01025851-7049444 LP* 01 02 58.51680 -70 49 44.4072   14.36 13.02   11.54 ~ 4 0
5 2MASS J01030778-7049464 LP* 01 03 07.789 -70 49 46.47     12.94   11.55 ~ 2 0
6 2MASS J01031065-7050540 LP* 01 03 10.651 -70 50 54.01     12.66   10.97 ~ 1 0
7 [LW2011] NGC 362 LW4 LP* 01 03 13.60 -70 50 13.8     12.60   10.92 ~ 2 0
8 2MASS J01031361-7050369 LP* 01 03 13.616 -70 50 36.98     12.73   11.00 ~ 3 0
9 2MASS J01031379-7051092 LP* 01 03 13.796 -70 51 09.28     12.79   11.13 ~ 2 0
10 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 938 0
11 2MASS J01031474-7050588 LP* 01 03 14.74 -70 50 58.9   10.165 9.351   9.99 ~ 5 0
12 Cl* NGC 362 MV o1 * 01 03 15.10 -70 50 32.3           O-rich 13 0
13 2MASS J01031518-7051033 LP* 01 03 15.185 -70 51 03.34     12.89   11.43 ~ 2 0
14 2MASS J01031723-7050496 LP* 01 03 17.24 -70 50 49.7     12.71   10.32 ~ 2 0
15 Cl* NGC 362 SKJ V56 * 01 03 17.628 -70 50 49.37           ~ 2 0
16 2MASS J01031903-7050514 LP* 01 03 19.0349508699 -70 50 51.506645306     12.58   11.06 ~ 3 0
17 2MASS J01032007-7050549 LP* 01 03 20.0686864608 -70 50 55.078648593     12.57   10.94 ~ 2 0
18 Cl* NGC 362 TUC V2 * 01 03 21.8395168245 -70 54 20.126581222   13.61   11.79 11.11 O-rich 31 0
19 2MASS J01033301-7049372 RG* 01 03 33.0083530092 -70 49 37.354627079   14.14 12.77   11.25 ~ 23 0
20 2MASS J01033571-7050521 LP* 01 03 35.7116990970 -70 50 52.239033135   13.994 12.58   11.00 ~ 4 0
21 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 180 0
22 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
23 2MASS J09115033-6451422 LP* 09 11 50.338 -64 51 42.21   15.68 13.82   11.82 ~ 2 0
24 2MASS J09115707-6451296 LP* 09 11 57.0772295105 -64 51 29.670631898   15.25 13.40   11.32 ~ 8 0
25 2MASS J09115869-6451285 LP* 09 11 58.698 -64 51 28.50   15.034 13.646   12.123 ~ 3 0
26 2MASS J09115923-6452591 LP* 09 11 59.2378390145 -64 52 59.245342188   15.14 13.50   11.47 ~ 2 0
27 2MASS J09120142-6451374 LP* 09 12 01.421 -64 51 37.40     13.65   11.64 ~ 2 0
28 2MASS J09120150-6450493 LP* 09 12 01.4934518288 -64 50 49.335452850   15.33 13.85   12.10 ~ 2 0
29 2MASS J09120167-6450332 LP* 09 12 01.6839697010 -64 50 33.267850461   15.40 13.59   11.43 ~ 3 0
30 2MASS J09120227-6451184 LP* 09 12 02.28 -64 51 18.4   15.1 13.49   11.64 ~ 11 0
31 2MASS J09120271-6452017 LP* 09 12 02.711 -64 52 01.74   15.1 13.69   12.20 ~ 3 0
32 IRAS 09110-6439 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1244 0
33 [LW2011] NGC 2808 LW15 LP* 09 12 04.02 -64 51 54.0     13.89   11.74 ~ 3 0
34 2MASS J09120433-6451416 LP* 09 12 04.340 -64 51 41.66   15.0 13.42   11.36 ~ 2 0
35 2MASS J09120485-6451296 LP* 09 12 04.852 -64 51 29.69   16.02 14.28   12.82 ~ 2 0
36 2MASS J09120589-6452080 LP* 09 12 05.891 -64 52 08.08   15.05 13.58   11.80 ~ 2 0
37 2MASS J09120666-6452180 LP* 09 12 06.664 -64 52 18.08   15.2 13.54   11.65 ~ 2 0
38 Cl* NGC 2808 SAW V11 LP* 09 12 06.7268633335 -64 52 40.295163599   14.5 12.9   11.1 ~ 5 1
39 2MASS J09120851-6451583 LP* 09 12 08.51 -64 51 58.4   15.15 13.62   11.69 ~ 12 0
40 2MASS J09121130-6452421 LP* 09 12 11.3080022731 -64 52 42.244714298   15.3 13.52   11.66 ~ 2 0
41 2MASS J09121447-6453266 LP* 09 12 14.48 -64 53 26.7   15.14 13.34   11.55 ~ 3 0
42 2MASS J09121664-6452028 LP* 09 12 16.6462942572 -64 52 02.879443283   15.23 13.51   11.58 ~ 7 0
43 2MASS J09121847-6451306 LP* 09 12 18.48 -64 51 30.6   15.24 13.72   12.01 ~ 3 0
44 2MASS J09122021-6452204 LP* 09 12 20.2263551789 -64 52 20.516761031   14.8 13.4   11.2 ~ 7 0
45 2MASS J09122477-6451103 LP* 09 12 24.7897409034 -64 51 10.374737180   15.26 13.44   11.77 ~ 2 0
46 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2907 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-13:09:03

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