2024A&A...688A.152J

Query : 2024A&A...688A.152J

2024A&A...688A.152J - Astronomy and Astrophysics, volume 688A152 (2024/8-1)

UOCS XIV. Uncovering extremely low-mass white dwarfs and blue lurkers in NGC 752.

JADHAV V.V., SUBRAMANIAM A. and SAGAR R.

Abstract (from CDS):

Context. Evolutionary pathways of binary systems are vastly different from single stellar evolution, and thus there is a need to quantify their frequency and diversity. Thanks to their to their coeval nature, open clusters are the best test beds for unveiling the secrets of binary populations. The availability of multi-wavelength data in recent years has been critical in characterising the binary population.
Aims. NGC 752 is a solar-metallicity, intermediate-age open cluster located at 460 pc. In this work, we aim to identify the optically sub-luminous white dwarfs in NGC 752 and identify the elusive blue lurkers by association.
Methods. We used multi-wavelength photometry from AstroSat/UVIT, Swift/UVOT, Gaia DR3, and other archival surveys to analyse the colour-magnitude diagrams and spectral energy distributions of 37 cluster members.
Results. We detected eight white dwarf companions of cluster members. Four of the systems are main sequence stars with extremely low-mass white dwarfs as their companions. Two of these main sequence stars are also fast rotators.
Conclusions. The presence of low-mass white dwarfs and fast rotation signals a past mass transfer, and we classify the four main sequence stars as blue lurkers. The binary fraction in NGC 752 is estimated to be 50-70%, and it shows that the contribution of optically undetected stars is crucial in quantifying the present-day binary fraction.

Abstract Copyright: © The Authors 2024

Journal keyword(s): catalogs - binaries: general - Hertzsprung-Russell and C-M diagrams - white dwarfs - open clusters and associations: individual: NGC 752 - ultraviolet: stars

VizieR on-line data: <Available at CDS (J/A+A/688/A152): table3.dat>

Simbad objects: 50

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Number of rows : 50
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 752 94 * 01 56 36.8663487936 +37 45 12.777547428   14.64 13.84     K0.4 23 0
4 BD+37 419 * 01 56 39.2172519701 +37 51 41.199095880   10.69 10.33     F3.6 40 0
5 2MASS J01564701+3740305 * 01 56 47.0159041992 +37 40 30.523362312           K5.4 16 0
6 BD+37 423 * 01 56 53.0478578400 +37 52 09.471510264   10.67 10.23     F4V 36 0
7 2MASS J01565339+3753502 * 01 56 53.3921059959 +37 53 50.233579626           K5.1 19 0
8 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
9 NGC 752 123 * 01 56 55.7641419093 +37 47 59.433090318   11.7 11.03     F3V 35 0
10 BD+36 361 * 01 56 56.3382217728 +37 39 51.491372832   10.43 10.19     F5.1 38 0
11 NGC 752 135A * 01 57 02.4849233976 +37 53 07.607653332           ~ 18 0
12 NGC 752 139 * 01 57 03.1771110120 +37 55 44.646449952   12.19 11.72     F4.3 40 0
13 2MASS J01570780+3749279 * 01 57 07.8089570686 +37 49 27.947178390           K7.6 14 0
14 NGC 752 151 * 01 57 10.4812296227 +38 02 06.559590796   12.83 12.28     F7.6 30 0
15 BD+37 425 * 01 57 12.1193904552 +37 59 24.849743568   9.84 9.39     F5.5IV 31 0
16 NGC 752 167 * 01 57 14.6830104024 +37 54 10.926170676   14.31 13.52 13.23   ~ 21 0
17 NGC 752 176 * 01 57 19.4148925005 +37 59 23.517228965     12.072     F5.8 27 0
18 BD+37 427 * 01 57 20.7168532248 +37 51 43.251003576   10.53 10.10     F4III 35 0
19 Gaia DR3 342861191926302848 * 01 57 22.2683128654 +37 36 23.100580012           ~ 17 0
20 BD+36 364 SB* 01 57 25.9971536808 +37 43 19.705396764   10.80 10.44     F4.9 40 0
21 NGC 752 192 * 01 57 27.4669716984 +37 35 10.427611884   11.05 10.90     F4.9 35 0
22 NGC 752 197 * 01 57 31.8435878040 +37 53 40.690325940   12.03 11.58 11.53   F3 43 0
23 NGC 752 199 * 01 57 32.5647083112 +37 42 05.748772464     13.943     K0.2 17 0
24 NGC 752 365 * 01 57 35.8957218792 +37 58 23.052883584     14.20     ~ 20 0
25 BD+37 432 * 01 57 38.9498019528 +37 46 12.414071532   9.98 9.00     G9III 70 0
26 NGC 752 214 * 01 57 39.4453277280 +37 52 25.937726340   10.82 10.44     F5.0 29 0
27 BD+37 434 * 01 57 44.7279060600 +37 59 18.455078220   10.48 10.09     F2III 54 0
28 2MASS J01574506+3743176 * 01 57 45.0636401064 +37 43 17.514791148           ~ 12 0
29 V* DS And SB* 01 57 46.0564787701 +38 04 28.431446959   10.89 10.52     F5.7 90 0
30 NGC 752 227 * 01 57 51.4089879192 +37 39 52.547717700   15.03 14.10     K0.9 25 0
31 NGC 752 232 ** 01 57 55.1815593384 +37 52 46.107707340   12.04 11.60 11.57   F3.6 28 0
32 V* QX And SB* 01 57 57.7816919821 +37 48 22.453231805   11.736 11.25 11.23 10.68 F5 126 0
33 BD+37 439 SB* 01 57 59.3463766904 +37 54 53.966263676   10.32 9.85     F2III 52 0
34 NGC 752 244 * 01 58 02.7689439335 +38 02 30.456388484     12.912     G7.7 32 0
35 NGC 752 252 * 01 58 06.2891164272 +37 38 06.773645544     13.11     G9.7 23 0
36 BD+36 373 SB* 01 58 07.6967785488 +37 39 57.081270924   11.2 10.6     F2.1 49 0
37 2MASS J01581109+3747537 * 01 58 11.1002792003 +37 47 53.816376767           K5.6 20 0
38 NGC 752 259 * 01 58 11.4129574776 +37 39 33.472227996   11.7 11.6     F4.2 46 0
39 NGC 752 266 SB* 01 58 16.8604780200 +37 38 15.997654788   11.64 11.21     F6.4 41 0
40 BD+37 441 Em* 01 58 29.8173119448 +37 51 37.575588024   10.23 9.29     G5 79 0
41 NGC 752 298 * 01 58 34.4049168624 +37 40 15.202008480     13.66     G9.1 21 0
42 BD+37 444 SB* 01 58 36.8870823055 +37 45 10.723821795   9.94 9.62     F2V 47 0
43 2MASS J01584873+3747010 * 01 58 48.7384998217 +37 47 01.085389815           K4.7 19 0
44 Cl Melotte 66 OpC 07 26 19.2 -47 41 14   8.73       ~ 213 0
45 NGC 2506 OpC 08 00 02.3 -10 46 22   8.28 7.6     ~ 313 0
46 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
47 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
48 NGC 6971 GiG 20 49 23.7758083224 +05 59 44.125677636   14.8       ~ 29 0
49 NGC 7142 OpC 21 45 10.2 +65 47 05   10.36 9.3     ~ 157 0
50 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0

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