NY Virginis information

NY Virginis
	; A light curve for NY Virginis, plotted from TESS data
Observation data; Epoch J2000 Equinox J2000
Constellation	Virgo
Right ascension	13h 38m 48.14669s
Declination	−02° 01′ 49.2073″
Apparent magnitude (V)	13.30 - 14.22
Characteristics
Spectral type	sdB + M5
Variable type	EA + RPHS
Astrometry
Radial velocity (Rv)	−25.0 km/s
Proper motion (μ)	RA: −6.145±0.054 mas/yr ; Dec.: −12.054±0.025 mas/yr
Parallax (π)	1.6801 ± 0.0376 mas
Distance	1,940 ± 40 ly ; (600 ± 10 pc)
Absolute magnitude (MV)	4.49
Orbit
Primary	NY Virginis A
Companion	NY Virginis B
Period (P)	0.101015968166 d
Semi-major axis (a)	0.0160 AU
Eccentricity (e)	0.46
Details
NY Virginis A
Mass	0.459±0.005 M☉
Radius	0.151±0.001 R☉
Luminosity	23.3±1.5 L☉
Surface gravity (log g)	5.739±0.002 cgs
Temperature	32,740±400 K
Rotation	2.42438 hours
NY Virginis B
Mass	0.122 M☉
Radius	0.16 R☉
Surface gravity (log g)	5.14 cgs
Temperature	3,000 K
Other designations
	Gaia DR2 3637481302758519040, GSC 04966-00491, 2MASS J13384814-0201491, PG 1336−018
Database references
SIMBAD	data

NY Virginis is a binary star about 1,940 light-years away. The primary belongs to the rare class of subdwarf B stars, being former red giants with their hydrogen envelope completely stripped by a stellar companion. The companion is a red dwarf star.^[8] The binary nature of NY Virginis was first identified in 1998,^[9] and the extremely short orbital period of 0.101016 d, together with brightness variability on the timescale of 200 seconds was noticed, resulting in the identification of the primary star as a B-type subdwarf in 2003.^[10] Under a proposed classification scheme for hot subdwarfs it would be class sdB1VII:He1. This non-standard system indicates that it is a "normal" luminosity for a hot subdwarf and that the spectrum is dominated by hydrogen rather than helium.^[11]

^ Cite error: The named reference MAST was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
^ ^a ^b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
^ Cite error: The named reference Shuo2019 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference charpinet2008 was invoked but never defined (see the help page).
^ Cite error: The named reference Lee2014 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Vuckovic2007 was invoked but never defined (see the help page).
^ Kilkenny, D.; O'Donoghue, D.; Koen, C.; Lynas-Gray, A. E.; Van Wyk, F. (1998). "The EC 14026 stars - VIII. PG 1336-018: A pulsating SDB star in an HWVir-type eclipsing binary". Monthly Notices of the Royal Astronomical Society. 296 (2): 329. Bibcode:1998MNRAS.296..329K. doi:10.1046/j.1365-8711.1998.01432.x.
^ Kilkenny, D.; Reed, M. D.; O'Donoghue, D.; Kawaler, S. D.; Mukadam, A.; Kleinman, S. J.; Nitta, A.; Metcalfe, T. S.; Provencal, J. L.; Watson, T. K.; Sullivan, D. J.; Sullivan, T.; Shobbrook, R.; Jiang, X. J.; Joshi, S.; Ashoka, B. N.; Seetha, S.; Leibowitz, E.; Ibbetson, P.; Mendelson, H.; Meištas, E.; Kalytis, R.; Ališauskas, D.; Martinez, P.; Van Wyk, F.; Stobie, R. S.; Marang, F.; Zola, S.; Krzesinski, J.; et al. (2003). "A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336-018 (NY Vir)". Monthly Notices of the Royal Astronomical Society. 345 (3): 834. Bibcode:2003MNRAS.345..834K. doi:10.1046/j.1365-8711.2003.07007.x. hdl:10183/89981.
^ Drilling, J. S.; Jeffery, C. S.; Heber, U.; Moehler, S.; Napiwotzki, R. (2013). "An MK-like system of spectral classification for hot subdwarfs". Astronomy & Astrophysics. 551: A31. Bibcode:2013A&A...551A..31D. doi:10.1051/0004-6361/201219433.

[MAST-1] Cite error: The named reference MAST was invoked but never defined (see the help page).

[GaiaDR3-2] Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[gcvs-3] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.

[Shuo2019-4] Cite error: The named reference Shuo2019 was invoked but never defined (see the help page).

[SIMBAD-5] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[charpinet2008-6] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference charpinet2008 was invoked but never defined (see the help page).

[Lee2014-7] Cite error: The named reference Lee2014 was invoked but never defined (see the help page).

[Vuckovic2007-8] Cite error: The named reference Vuckovic2007 was invoked but never defined (see the help page).

[9] Kilkenny, D.; O'Donoghue, D.; Koen, C.; Lynas-Gray, A. E.; Van Wyk, F. (1998). "The EC 14026 stars - VIII. PG 1336-018: A pulsating SDB star in an HWVir-type eclipsing binary". Monthly Notices of the Royal Astronomical Society. 296 (2): 329. Bibcode:1998MNRAS.296..329K. doi:10.1046/j.1365-8711.1998.01432.x.

[Kilkenny2003-10] Kilkenny, D.; Reed, M. D.; O'Donoghue, D.; Kawaler, S. D.; Mukadam, A.; Kleinman, S. J.; Nitta, A.; Metcalfe, T. S.; Provencal, J. L.; Watson, T. K.; Sullivan, D. J.; Sullivan, T.; Shobbrook, R.; Jiang, X. J.; Joshi, S.; Ashoka, B. N.; Seetha, S.; Leibowitz, E.; Ibbetson, P.; Mendelson, H.; Meištas, E.; Kalytis, R.; Ališauskas, D.; Martinez, P.; Van Wyk, F.; Stobie, R. S.; Marang, F.; Zola, S.; Krzesinski, J.; et al. (2003). "A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336-018 (NY Vir)". Monthly Notices of the Royal Astronomical Society. 345 (3): 834. Bibcode:2003MNRAS.345..834K. doi:10.1046/j.1365-8711.2003.07007.x. hdl:10183/89981.

[11] Drilling, J. S.; Jeffery, C. S.; Heber, U.; Moehler, S.; Napiwotzki, R. (2013). "An MK-like system of spectral classification for hot subdwarfs". Astronomy & Astrophysics. 551: A31. Bibcode:2013A&A...551A..31D. doi:10.1051/0004-6361/201219433.

Observation data Epoch J2000 Equinox J2000
A light curve for NY Virginis, plotted from TESS data^[1]
Constellation	Virgo
Right ascension	13^h 38^m 48.14669^s^[2]
Declination	−02° 01′ 49.2073″^[2]
Apparent magnitude (V)	13.30 - 14.22^[3]
Characteristics
Spectral type	sdB + M5^[4]
Variable type	EA + RPHS^[3]
Astrometry

Radial velocity (R_v)	−25.0^[5] km/s
Proper motion (μ)	RA: −6.145±0.054 mas/yr^[2] Dec.: −12.054±0.025 mas/yr^[2]
Parallax (π)	1.6801 ± 0.0376 mas^[2]
Distance	1,940 ± 40 ly (600 ± 10 pc)
Absolute magnitude (M_V)	4.49^[6]

Orbit^[7]
Primary	NY Virginis A
Companion	NY Virginis B
Period (P)	0.101015968166 d
Semi-major axis (a)	0.0160 AU
Eccentricity (e)	0.46
Details
NY Virginis A
Mass	0.459±0.005^[6] `M`_☉
Radius	0.151±0.001^[6] `R`_☉
Luminosity	23.3±1.5^[6] `L`_☉
Surface gravity (log g)	5.739±0.002^[6] cgs
Temperature	32,740±400^[6] K
Rotation	2.42438 hours^[6]
NY Virginis B
Mass	0.122^[8] `M`_☉
Radius	0.16^[8] `R`_☉
Surface gravity (log g)	5.14^[8] cgs
Temperature	3,000^[8] K
Other designations
Gaia DR2 3637481302758519040, GSC 04966-00491, 2MASS J13384814-0201491, PG 1336−018^[5]
Database references
SIMBAD	data

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