2022MNRAS.511.2274V

Query : 2022MNRAS.511.2274V

2022MNRAS.511.2274V - Mon. Not. R. Astron. Soc., 511, 2274-2284 (2022/April-1)

UOCS - VII. Blue straggler populations of open cluster NGC 7789 with UVIT/AstroSat.

VAIDYA K., PANTHI A., AGARWAL M., PANDEY S., RAO K.K., JADHAV V. and SUBRAMANIAM A.

Abstract (from CDS):

NGC 7789 is a ∼1.6 Gyr old, populous open cluster located at ∼2000 pc. We characterize the blue straggler stars (BSS) of this cluster using the Ultraviolet (UV) data from the UVIT/AstroSat. We present spectral energy distributions (SED) of 15 BSS candidates constructed using multiwavelength data ranging from UV to IR wavelengths. In 8 BSS candidates, a single temperature SED is found to be satisfactory. We discover hot companions in 5 BSS candidates. The hot companions with Teff ∼ 11750-15500 K, R ∼ 0.069-0.242 R☉, and L ∼ 0.25-1.55 L☉, are most likely extremely low mass (ELM) white dwarfs (WDs) with masses smaller than ∼0.18 M☉, and thereby confirmed post mass transfer systems. We discuss the implication of this finding in the context of BSS formation mechanisms. Two additional BSS show excess in one or more UV filters, and may have a hot companion, however we are unable to characterize them. We suggest that at least 5 of the 15 BSS candidates (33 per cent) studied in this cluster have formed via the mass-transfer mechanism.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): blue stragglers

Simbad objects: 22

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Number of rows : 22
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 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
2 Cl King 2 OpC 00 50 57.3 +58 11 09   21.39 19.78     ~ 71 0
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
4 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
5 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
6 [NMM2020] WOCS 10011 SB* 23 56 42.1105716515 +56 44 12.420106665           ~ 3 0
7 NGC 7789 282 BS* 23 56 49.0212781200 +56 38 18.760515648   12.27 12.0100   11.601 ~ 20 0
8 NGC 7789 316 BS* 23 56 54.2384834544 +56 40 46.790111712   14.15 13.7518   13.270 ~ 18 0
9 NGC 7789 342 BS* 23 56 56.7409401672 +56 41 11.200911828   12.59 12.3745   12.025 B9 30 0
10 NGC 7789 371 BS* 23 56 59.0233671600 +56 47 33.118292724   13.27 12.9070   12.419 A3V 24 0
11 NGC 7789 453 * 23 57 06.4107002616 +56 46 50.133397080   12.85 12.6123   12.232 B9 17 0
12 [NMM2020] WOCS 36011 SB* 23 57 08.8468712256 +56 38 37.424190084           ~ 8 0
13 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0
14 NGC 7789 696 BS* 23 57 26.7400490376 +56 48 25.974763416   14.06 13.7174   13.342 ~ 14 0
15 NGC 7789 746 BS* 23 57 30.3612161664 +56 44 30.351673788   13.13 12.8105   12.344 ~ 25 0
16 V* V735 Cas dS* 23 57 30.9311442120 +56 39 49.077856872   14.61       ~ 16 0
17 [NMM2020] WOCS 20009 BS* 23 57 49.7882430840 +56 44 37.025472660           ~ 10 0
18 [NMM2020] WOCS 27010 BS* 23 57 55.9372858992 +56 42 43.570671084           ~ 9 0
19 NGC 7789 1095 BS* 23 58 05.2636243920 +56 47 02.870218320           ~ 12 0
20 NGC 7789 1168 BS* 23 58 17.8053306192 +56 49 39.894482100   14.35 13.8584   13.291 A3V 17 0
21 [NMM2020] WOCS 25024 * 23 58 45.6993963528 +56 44 39.938527752           ~ 8 0
22 [NMM2020] WOCS 9027 * 23 58 51.6258783322 +56 39 07.464672208           ~ 2 0

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