J/A+A/676/A47 UOCS study of NGC 6791 (Jadhav+, 2023)
UOCS. X. Rich collection of post mass transfer systems in NGC 6791.
Jadhav V.V., Subramaniam A., Sagar R.
<Astron. Astrophys. 676, A47 (2023)>
=2023A&A...676A..47J 2023A&A...676A..47J (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, ultraviolet ; Optical
Keywords: binaries: general -
open clusters and associations: individual: NGC 6791 -
ultraviolet: stars - catalogs
Abstract:
NGC 6791 is one of the richest old open clusters in the Milky Way. Its
position above the Galactic plane and the number density makes it an
interesting middle ground between Galactic open and globular clusters.
We aim to detect the UV bright population of NGC 6791 using
AstroSat/UVIT images in near-UV and far-UV filters and characterise
the known post mass transfer systems such as blue straggler stars
(BSSs).
We identified 20 members with large UV flux (out of 91 cluster members
among 1180 detections), suggestive of binarity, interactions or
stellar activity using multi-wavelength spectral energy distribution
analysis.
We characterised 62 isolated cluster members, including five hot
subdwarfs (sdA/sdB). Additionally, we detected ten sdA/sdB/extremely
low mass white dwarf (ELM) type candidates hidden alongside other
cluster members. Additionally, we report the discovery of four
candidate blue lurkers, which are main sequence stars with mass
accretion history.
We report that this cluster has a variety of stellar (pre-)remnants,
such as sdBs, sdAs, and ELM white dwarfs, that are by-products of
binary evolution. The above are likely to be post mass transfer
binaries found throughout the evolutionary phases from the main
sequence to the post horizontal branch. Therefore, this dynamically
old open cluster is unique, making it an ideal testbed for dynamical
studies.
Description:
UVIT photometry and SED parameters of NGC 6791 cluster members.
Objects:
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RA (2000) DE Designation(s)
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19 20 53.04 +37 46 40.7 NGC 6791 = Cl Berkeley 46
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 257 91 Photometry and SED parameters
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See also:
I/355 : Gaia DR3 (Gaia Collaboration, 2022)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/MNRAS/503/236 : UVIT catalog & membership of 6 open clusters (Jadhav+, 2021)
J/AcA/72/77 : Variable star population in NGC 6791 (Sanjayan+, 2022)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Name (Star0-star90)
8- 17 F10.6 deg RAdeg Right ascension (ICRS) at Ep=2016
19- 27 F9.6 deg DEdeg Declination (ICRS) at Ep=2016
29- 47 I19 --- GaiaDR3 Gaia EDR3 source_id
49- 54 F6.3 mag Gmag ? Gaia DR3 mean G magnitude
56- 61 F6.3 mag BP-RP ? Gaia DR3 BP minus RP colour
63- 68 F6.3 mag F172M ? UVIT/F172M magnitude (AB)
70- 74 F5.3 mag e_F172M ? Error in F172M magnitude
76- 81 F6.3 mag N245M ? UVIT/N245M magnitude (AB)
83- 87 F5.3 mag e_N245M ? Error in N245M magnitude
89- 94 F6.3 mag N263M ? UVIT/N263M magnitude (AB)
96-100 F5.3 mag e_N263M ? Error in N263M magnitude
102-107 F6.3 mag N279N ? UVIT/N279N magnitude (AB)
109-113 F5.3 mag e_N279N ? Error in N279N magnitude
115-121 F7.1 K TeA ? Temperature of A component
123-127 F5.1 K e_TeA ? Error in TeA
129-135 F7.4 Lsun LumA ? Luminosity of A component
137-143 F7.4 Lsun e_LumA ? Error in LumA
145-151 F7.4 Rsun RadA ? Radius of A component
153-158 F6.4 Rsun e_RadA ? Error in RA
160-172 A13 --- modelA Models used for SED fitting of A component
174-180 F7.1 K TeB ? Temperature of B component
182-187 F6.1 K e_TeB ? Error in TeB
189-194 F6.4 Lsun LumB ? Luminosity of B component
196-201 F6.4 Lsun e_LumB ? Error in LumB
203-208 F6.4 Rsun RadB ? Radius of B component
210-215 F6.4 Rsun e_RadB ? Error in RB
217-223 A7 --- modelB Model used for SED fitting of B component
225-257 A33 --- Comment Comments based on SED fitting (1)
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Note (1): based on Tofflemire et al. (2014AJ....148...61T 2014AJ....148...61T) and
Sanjayan et al. (2022AcA....72...77S 2022AcA....72...77S, Cat. J/AcA/72/77).
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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
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
Tofflemire et al., 2014AJ....148...61T 2014AJ....148...61T
Sanjayan et al., 2022AcA....72...77S 2022AcA....72...77S, Cat. J/AcA/72/77
(End) Patricia Vannier [CDS] 28-Jun-2023