2014ApJ...783...34F

Query : 2014ApJ...783...34F

2014ApJ...783...34F - Astrophys. J., 783, 34 (2014/March-1)

Blue straggler masses from pulsation properties. I. The case of NGC 6541.

FIORENTINO G., LANZONI B., DALESSANDRO E., FERRARO F.R., BONO G. and MARCONI M.

Abstract (from CDS):

We used high spatial resolution images acquired with the Wide Field Camera 3 on board Hubble Space Telescope to probe the population of variable blue straggler stars (BSSs) in the central region of the poorly studied Galactic globular cluster NGC 6541. The time sampling of the acquired multiwavelength (F390W, F555W, and F814W) data allowed us to discover three WUMa stars and nine SX Phoenicis. Periods, mean magnitudes, and pulsation modes have been derived for the nine SX Phoenicis, and their masses have been estimated by using pulsation equations obtained from linear nonadiabatic models. We found masses in the range 1.0-1.1 M☉, with an average value of 1.06±0.09 M☉(σ = 0.04), significantly in excess of the cluster main-sequence turn-off mass (∼0.75 M☉). A mild trend between mass and luminosity seems also to be present. The computed pulsation masses turn out to be in very good agreement with the predictions of evolutionary tracks for single stars, indicating values in the range ∼1.0-1.2 M☉ for most of the BSS population, in agreement with what was discussed in a number of previous studies.

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Journal keyword(s): binaries: general - blue stragglers - globular clusters: individual: NGC 6541 - stars: fundamental parameters

Nomenclature: Table 1: [FLD2014] WUMa N (Nos 1-3) = Cl* NGC 6541 SAW VNN (Nos V9-V11), [FLD2014] SXP N (Nos 1-9) = Cl* NGC 6541 SAW VNN (Nos V12-V20).

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
6 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
7 Cl* NGC 5139 SAW V209 BS* 13 26 17.2590081384 -47 23 17.168879292 16.915 16.721 16.578 16.566 16.364 ~ 21 0
8 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
9 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
10 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
12 [FLD2014] SXP 9 BS* 18 07 54 -43 43.1     17.14   16.66 ~ 1 0
13 [FLD2014] WUMa 2 BS* 18 08 00 -43 43.9     17.68   17.26 ~ 1 0
14 [FLD2014] SXP 1 BS* 18 08 00 -43 42.7     17.67   17.21 ~ 1 0
15 [FLD2014] WUMa 3 BS* 18 08 01 -43 42.0     18.08   17.72 ~ 1 0
16 [FLD2014] SXP 4 BS* 18 08 01 -43 42.9     17.95   17.49 ~ 1 0
17 [FLD2014] SXP 3 BS* 18 08 01.670 -43 42 52.26     17.20   16.76 ~ 2 0
18 [FLD2014] SXP 5 BS* 18 08 02 -43 43.2     17.11   16.55 ~ 1 0
19 [FLD2014] SXP 8 BS* 18 08 02 -43 42.1     17.87   17.36 ~ 1 0
20 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 409 0
21 [FLD2014] SXP 7 BS* 18 08 03 -43 43.2     18.12   17.65 ~ 1 0
22 [FLD2014] SXP 2 BS* 18 08 03 -43 42.1     17.40   16.90 ~ 1 0
23 [FLD2014] SXP 6 BS* 18 08 03 -43 43.0     17.70   17.27 ~ 1 0
24 [FLD2014] WUMa 1 BS* 18 08 03 -43 42.1     18.11   17.62 ~ 1 0
25 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
26 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0

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