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


Query : 2011A&A...529A.137L

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 - 2024
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3911 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11135 1
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1041 0
4 2MASS J01025851-7049444 LP* 01 02 58.5131996808 -70 49 44.447162844   14.206 13.02   11.54 ~ 17 1
5 Cl* NGC 362 TUC 215 RG* 01 03 07.7825635128 -70 49 46.495031340     12.94   11.55 ~ 14 0
6 2MASS J01031065-7050540 LP* 01 03 10.6499236752 -70 50 54.075141348     12.66   10.97 ~ 7 0
7 [LW2011] NGC 362 LW4 LP* 01 03 13.60 -70 50 13.8     12.60   10.92 ~ 3 0
8 2MASS J01031361-7050369 LP* 01 03 13.6276329024 -70 50 37.084757460     12.73   11.00 ~ 11 0
9 2MASS J01031379-7051092 LP* 01 03 13.8009643519 -70 51 09.419966259     12.79   11.13 ~ 6 0
10 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1083 0
11 2MASS J01031474-7050588 RG* 01 03 14.74320 -70 50 58.8948           ~ 10 0
12 2MASS J01031518-7051033 LP* 01 03 15.185 -70 51 03.34     12.89   11.43 ~ 2 0
13 Cl* NGC 362 MV o1 V* 01 03 15.19 -70 50 36.7           O-rich 17 0
14 2MASS J01031723-7050496 RG* 01 03 17.1482315753 -70 50 49.663145163     12.71   10.32 ~ 5 0
15 Cl* NGC 362 SKJ V56 EB* 01 03 17.628 -70 50 49.37     12.30   12.46 ~ 3 0
16 Cl* NGC 362 FWM ay RG* 01 03 19.0347012192 -70 50 51.504700920     12.58   11.06 ~ 9 0
17 2MASS J01032007-7050549 LP* 01 03 20.0683766880 -70 50 55.073394960     12.57   10.94 ~ 8 0
18 Cl* NGC 362 TUC V2 Pe* 01 03 21.8399257776 -70 54 20.124907380   13.61   11.79 11.11 O-rich 35 0
19 NGC 362 3039 RG* 01 03 33.0080720232 -70 49 37.352379540   14.14 12.77   11.25 ~ 28 0
20 2MASS J01033571-7050521 LP* 01 03 35.7120138456 -70 50 52.239186924     12.63 12.200 11.00 ~ 23 0
21 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 215 0
22 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17416 0
23 2MASS J09115033-6451422 LP* 09 11 50.3497782776 -64 51 42.198972558   15.68 13.82   11.82 ~ 4 0
24 Cl* NGC 2808 PKD 50761 RG* 09 11 57.0767355888 -64 51 29.674044036   15.25 13.40   11.32 ~ 12 0
25 2MASS J09115869-6451285 AB* 09 11 58.7058126720 -64 51 28.590333516   15.034 13.646   12.123 ~ 7 0
26 2MASS J09115923-6452591 LP* 09 11 59.2378532928 -64 52 59.246395032   15.14 13.50   11.47 ~ 5 0
27 2MASS J09120142-6451374 LP* 09 12 01.421 -64 51 37.40     13.65   11.64 ~ 2 0
28 Cl* NGC 2808 SAW V47 LP* 09 12 01.4936762184 -64 50 49.335094320   15.33 13.85 13.168 12.10 ~ 7 0
29 2MASS J09120167-6450332 LP* 09 12 01.6836380592 -64 50 33.269509932   15.40 13.59   11.43 ~ 4 0
30 2MASS J09120227-6451184 LP* 09 12 02.28 -64 51 18.4   15.1 13.49   11.64 ~ 12 0
31 2MASS J09120271-6452017 LP* 09 12 02.711 -64 52 01.74   15.1 13.69   12.20 ~ 3 0
32 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1419 0
33 Cl* NGC 2808 SAW V45 LP* 09 12 04.0141402933 -64 51 53.948838255     13.89   11.74 ~ 5 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 05.8839383039 -64 52 08.128067722   15.05 13.58   11.80 ~ 3 0
37 2MASS J09120666-6452180 LP* 09 12 06.6606683304 -64 52 18.194311020   15.2 13.54   11.65 ~ 3 0
38 Cl* NGC 2808 SAW V11 LP* 09 12 06.7272686520 -64 52 40.295786988   14.5 12.9   11.1 ~ 6 1
39 2MASS J09120851-6451583 LP* 09 12 08.5127118048 -64 51 58.432343904   15.15 13.62   11.69 ~ 13 0
40 2MASS J09121130-6452421 LP* 09 12 11.3077622376 -64 52 42.244215240   15.3 13.52   11.66 ~ 4 0
41 Cl* NGC 2808 SAW V42 LP* 09 12 14.4779034048 -64 53 26.685169008   15.14 13.34 12.801 11.55 ~ 4 0
42 Cl* NGC 2808 PKD 48609 RG* 09 12 16.6461451776 -64 52 02.880935184   15.23 13.51   11.58 ~ 10 0
43 2MASS J09121847-6451306 LP* 09 12 18.4805556072 -64 51 30.726681336   15.24 13.72   12.01 ~ 5 0
44 2MASS J09122021-6452204 LP* 09 12 20.2262395152 -64 52 20.517485268   14.8 13.4   11.2 ~ 9 0
45 2MASS J09122477-6451103 LP* 09 12 24.7897488720 -64 51 10.376268516   15.26 13.44   11.77 ~ 2 0
46 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3138 0

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