HD 139319

HD 139319
	; A light curve for TW Draconis, plotted from TESS data
Observation data; Equinox J2000.0]] (ICRS)
Constellation	Draco
Right ascension	15h 33m 51.0571s
Declination	+63° 54′ 25.6950″
Apparent magnitude (V)	7.46
Characteristics
HD 139319A
Spectral type	A8V+K0III
Apparent magnitude (g)	7.39
HD 139319B
Spectral type	F7V
Apparent magnitude (g)	9.65
Astrometry
HD 139319A
Proper motion (μ)	RA: 11.44±0.03 mas/yr ; Dec.: 22.39±0.02 mas/yr
Parallax (π)	6.0571 ± 0.0179 mas
Distance	538 ± 2 ly ; (165.1 ± 0.5 pc)
HD 139319B
Radial velocity (Rv)	1.6±0.7 km/s
Proper motion (μ)	RA: 12.09±0.02 mas/yr ; Dec.: 21.278±0.018 mas/yr
Parallax (π)	6.0345 ± 0.0160 mas
Distance	540 ± 1 ly ; (165.7 ± 0.4 pc)
Orbit
Primary	TW Draconis A
Companion	TW Draconis B
Period (P)	2.8068491 d
Semi-major axis (a)	0.057 AU
Inclination (i)	86.8°
Semi-amplitude (K1); (primary)	64.05 km/s
Semi-amplitude (K2); (secondary)	150 km/s
Details
TW Draconis A
Mass	2.16±0.11 M☉
Radius	2.64±0.04 R☉
Surface gravity (log g)	3.928±0.026 cgs
Temperature	7815±92 K
TW Draconis B
Mass	0.93±0.05 M☉
Radius	3.66±0.06 R☉
Surface gravity (log g)	3.314±0.026 cgs
Temperature	4442±32 K
Other designations
	BD+64 1077, HIP 76196, 2MASS J15335104+6354257, GSC 04184-00061
	HD 139319A: TW Draconis, TYC 4184-61-1, Gaia DR2 1640708022815757568
	HD 139319B: TYC 4184-61-2, Gaia DR2 1640708022815757824
Database references
SIMBAD	data

Short description: Triple star system in constellation Draco

Coordinates: 15^h 33^m 51.0571^s, +63° 54′ 25.6950″

HD 139319 is a ternary system composed of the binary Algol variable star known as TW Draconis, and a main-sequence companion star at a separation of 3 arcseconds.^[6] The system lies in the constellation of Draco about 540 light years away.

System

The primary star is an eclipsing, semi-detached binary, the brighter component of which is a pulsating star of Delta Scuti type. Its pulsation frequency is 17.99 cycles per day.^[3] Mass transfer between stars is ongoing in the system^[8] with a transfer rate of 6.8×10⁻⁷M_☉/year. The 2.8 day period of the Algol binary is cyclically variable with a period 116.04 years, possibly due to gravitational influence of the distant companion HD 139319B. Another three stars in the system are suspected.^[6]

References

↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
↑ "TW Dra". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TW+Dra.
↑ ^3.0 ^3.1 Kim, S.-L.; Lee, J. W.; Kwon, S.-G.; Youn, J.-H.; Mkrtichian, D. E.; Kim, C. (2003), "Search for A–F Spectral type pulsating components in Algol-type eclipsing binary systems", Astronomy & Astrophysics 405: 231–236, doi:10.1051/0004-6361:20030630, Bibcode: 2003A&A...405..231K
↑ ^4.0 ^4.1 ^4.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
↑ ^5.0 ^5.1 ^5.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
↑ ^6.0 ^6.1 ^6.2 Liao, Wen-Ping; Qian, Sheng-Bang; Zejda, Miloslav; Zhu, Li-Ying; Li, Lin-Jia (2016), "Lunar-based Ultraviolet Telescope study of the well-known Algol-type binary TW Dra", Research in Astronomy and Astrophysics 16 (6): 009, doi:10.1088/1674-4527/16/6/094, Bibcode: 2016RAA....16...94L
↑ Bozic, H.; Nemravova, J.; Harmanec, P. (2013), "Standard UBV photometry and improved physical properties of TW Dra", Information Bulletin on Variable Stars 6086: 1, Bibcode: 2013IBVS.6086....1B
↑ Norton, A. J.; Lohr, M. E.; Smalley, B.; Wheatley, P. J.; West, R. G. (2016), "SuperWASP discovery and SALT confirmation of a semi-detached eclipsing binary that contains aδScuti star", Astronomy & Astrophysics 587: A54, doi:10.1051/0004-6361/201526881, Bibcode: 2016A&A...587A..54N

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Original source: https://en.wikipedia.org/wiki/HD 139319. Read more

[MAST-1] "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.

[SIMBAD-2] "TW Dra". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TW+Dra.

[Kim2003-3] 3.0 ^3.1 Kim, S.-L.; Lee, J. W.; Kwon, S.-G.; Youn, J.-H.; Mkrtichian, D. E.; Kim, C. (2003), "Search for A–F Spectral type pulsating components in Algol-type eclipsing binary systems", Astronomy & Astrophysics 405: 231–236, doi:10.1051/0004-6361:20030630, Bibcode: 2003A&A...405..231K

[EDR3A-4] 4.0 ^4.1 ^4.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.

[EDR3B-5] 5.0 ^5.1 ^5.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.

[Tkachenko2010-6] 6.0 ^6.1 ^6.2 Liao, Wen-Ping; Qian, Sheng-Bang; Zejda, Miloslav; Zhu, Li-Ying; Li, Lin-Jia (2016), "Lunar-based Ultraviolet Telescope study of the well-known Algol-type binary TW Dra", Research in Astronomy and Astrophysics 16 (6): 009, doi:10.1088/1674-4527/16/6/094, Bibcode: 2016RAA....16...94L

[7] Bozic, H.; Nemravova, J.; Harmanec, P. (2013), "Standard UBV photometry and improved physical properties of TW Dra", Information Bulletin on Variable Stars 6086: 1, Bibcode: 2013IBVS.6086....1B

[8] Norton, A. J.; Lohr, M. E.; Smalley, B.; Wheatley, P. J.; West, R. G. (2016), "SuperWASP discovery and SALT confirmation of a semi-detached eclipsing binary that contains aδScuti star", Astronomy & Astrophysics 587: A54, doi:10.1051/0004-6361/201526881, Bibcode: 2016A&A...587A..54N

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Observation data Equinox J2000.0]] (ICRS)
A light curve for TW Draconis, plotted from TESS data^[1]
Constellation	Draco
Right ascension	15^h 33^m 51.0571^s
Declination	+63° 54′ 25.6950″
Apparent magnitude (V)	7.46^[2]
Characteristics
HD 139319A
Spectral type	A8V+K0III ^[3]
Apparent magnitude (g)	7.39^[4]
HD 139319B
Spectral type	F7V
Apparent magnitude (g)	9.65^[5]
Astrometry
HD 139319A
Proper motion (μ)	RA: 11.44±0.03^[4] mas/yr Dec.: 22.39±0.02^[4] mas/yr
Parallax (π)	6.0571 ± 0.0179^[4] mas
Distance	538 ± 2 ly (165.1 ± 0.5 pc)
HD 139319B
Radial velocity (R_v)	1.6±0.7^[5] km/s
Proper motion (μ)	RA: 12.09±0.02 mas/yr Dec.: 21.278±0.018 mas/yr
Parallax (π)	6.0345 ± 0.0160^[5] mas
Distance	540 ± 1 ly (165.7 ± 0.4 pc)
Orbit^[6]
Primary	TW Draconis A
Companion	TW Draconis B
Period (P)	2.8068491 d
Semi-major axis (a)	0.057 AU
Inclination (i)	86.8°
Semi-amplitude (K₁) (primary)	64.05 km/s
Semi-amplitude (K₂) (secondary)	150 km/s
Details^[7]
TW Draconis A
Mass	2.16±0.11 `M`_☉
Radius	2.64±0.04 `R`_☉
Surface gravity (log g)	3.928±0.026 cgs
Temperature	7815±92 K
TW Draconis B
Mass	0.93±0.05 `M`_☉
Radius	3.66±0.06 `R`_☉
Surface gravity (log g)	3.314±0.026 cgs
Temperature	4442±32 K
Other designations
BD+64 1077, HIP 76196, 2MASS J15335104+6354257, GSC 04184-00061
HD 139319A: TW Draconis, TYC 4184-61-1, Gaia DR2 1640708022815757568
HD 139319B: TYC 4184-61-2, Gaia DR2 1640708022815757824
Database references
SIMBAD	data

HD 139319

Topic: Astronomy

System

References