J/A+A/688/A152 UOCS. XIV. blue lurkers in NGC 752 (Jadhav+, 2024)
UOCS. XIV.
Uncovering extremely low mass white dwarfs and blue lurkers in NGC 752.
Jadhav V.V., Subramaniam A., Sagar R.
<Astron. Astrophys. 688, A152 (2024)>
=2024A&A...688A.152J 2024A&A...688A.152J (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, ultraviolet ; Optical
Keywords: catalogs - binaries: general - Hertzsprung-Russell and C-M diagrams -
white dwarfs - open clusters and associations: individual: NGC 752 -
ultraviolet: stars
Abstract:
Evolutionary pathways of binary systems are vastly different from
single stellar evolution, and thus, there is a need to quantify their
frequency and diversity. Open clusters are the best test-bed to unveil
the secrets of binary populations due to their coeval nature. And the
availability of multi-wavelength data in recent years has been
critical in characterising the binary population. NGC 752 is a solar
metallicity, intermediate-age open cluster located at 460 pc. In this
work, we aim to identify the optically subluminous white dwarfs in NGC
752 and identify the illusive blue lurkers by association. We used
multiwavelength 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. We detected
eight white dwarfs as companions to cluster members. Four of the
systems are main sequence stars with extremely low mass white dwarfs
as their companions. Two are these main sequence stars are also fast
rotators. The presence of low mass white dwarfs and high rotation
signals a past mass transfer, and we classified the four main sequence
stars as blue lurkers. The binary fraction in NGC 752 was estimated to
be 50-70%, and it shows that the contribution of optically undetected
stars is crucial in quantifying the present-day binary fraction.
Description:
UVIT photometry and SED parameters of NGC 752 cluster members.
Objects:
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RA (2000) DE Designation(s)
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01 56 53.5 +37 47 38 NGC 752 = Cl Melotte 12
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 253 39 Photometry and SED parameters
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See also:
I/177 : Proper motions in NGC 752 (Platais+, 1992)
I/355 : Gaia DR3 (Gaia Collaboration, 2022)
J/AJ/158/35 : Swift UVOT Stars Survey. III. Galactic open clusters
(Siegel+, 2019)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Name (star0-star49)
8- 11 I4 --- Platais ? ID from Platais et al., 1992BICDS..40....5P 1992BICDS..40....5P
13- 30 I18 --- GaiaDR3 Gaia EDR3 source_id
32- 40 F9.6 deg RAdeg Right ascension (ICRS) at Ep=2016
42- 50 F9.6 deg DEdeg Declination (ICRS) at Ep=2016
52- 60 F9.6 mag Gmag Gaia DR3 mean G magnitude
62- 71 F10.8 mag BP-RP Gaia DR3 BP-RP colour
73- 78 F6.3 mag F148W ? UVIT/F148W magnitude (AB)
80- 84 F5.3 mag e_F148W ? Error in F148W magnitude)
86- 91 F6.3 mag F169M ? UVIT/F169M magnitude (AB)
93- 97 F5.3 mag e_F169M ? Error in F169M magnitude)
99-104 F6.1 K TeA ? Temperature of A component
106-111 F6.1 K b_TeA ? 16th percentile of TeA
113-118 F6.1 K B_TeA ? 84th percentile of TeA
120-124 F5.3 Rsun RA ? Radius of A component
126-130 F5.3 Rsun b_RA ? 16th percentile of RA
132-136 F5.3 Rsun B_RA ? 84th percentile of RA
138-143 F6.3 Lsun LA ? Luminosity of A component
145-150 F6.3 Lsun b_LA ? 16th percentile of LA
152-157 F6.3 Lsun B_LA ? 84th percentile of LA
159-161 F3.1 [cm/s2] loggA ? Surface gravity of A component
163-166 F4.1 --- MHA ? Metallicity of A component
168-174 F7.1 K TeB ? Temperature of B component
176-182 F7.1 K b_TeB ? 16th percentile of TeB
184-190 F7.1 K B_TeB ? 84th percentile of TeB
192-197 F6.4 Rsun RB ? Radius of B component
199-204 F6.4 Rsun b_RB ? 16th percentile of RB
206-211 F6.4 Rsun B_RB ? 84th percentile of RB
213-218 F6.4 Lsun LB ? Luminosity of B component
220-225 F6.4 Lsun b_LB ? 16th percentile of LB
227-232 F6.4 Lsun B_LB ? 84th percentile of LB
234-236 F3.1 [cm/s2] loggB ? Surface gravity of B component
238-244 F7.2 --- vgfb2 ? vgfb2 parameter of the SED fit
246-251 F6.2 --- chi2r ? Reduced chi2 parameter of the SED fit
253 I1 --- excessUV [0/1]? Presence of UV excess (1)
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Note (1): Presence of UV excess flag as follows:
0 = no excess
1 = UV excess
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Acknowledgements:
Vikrant V. Jadhav, vjadhav (at) uni-bonn.de
References:
Sindhu et al., Paper I 2019ApJ...882...43S 2019ApJ...882...43S
Jadhav et al., Paper II 2019ApJ...886...13J 2019ApJ...886...13J
Jadhav et al., Paper III 2021MNRAS.503..236J 2021MNRAS.503..236J
Jadhav et al., Paper IV 2021JApA...42...89J 2021JApA...42...89J
Rani et al., Paper V 2021JApA...42...47R 2021JApA...42...47R
Pandey et al., Paper VI 2021MNRAS.507.2373P 2021MNRAS.507.2373P
Vaidya et al., Paper VII 2022MNRAS.511.2274V 2022MNRAS.511.2274V
Panthi et al., Paper VIII 2022MNRAS.516.5318P 2022MNRAS.516.5318P
Rani et al., Paper IX 2023ApJ...945...11R 2023ApJ...945...11R
Jadhav et al., Paper X 2023A&A...676A..47J 2023A&A...676A..47J
Panthi et al., Paper XI 2023A&A...676A..47J 2023A&A...676A..47J
Panthi et al., Paper XII 2024MNRAS.52710335P 2024MNRAS.52710335P
Yadav et al., Paper XIII 2024ApJ...961..251Y 2024ApJ...961..251Y
(End) Patricia Vannier [CDS] 06-Jun-2024