HK Tauri

HK Tauri
	; A light curve for HK Tauri, adapted from Roggero et al. (2021)
Observation data; Epoch J2000 Equinox J2000
Constellation	Taurus
	A
Right ascension	04h 31m 50.5716s
Declination	+24° 24′ 17.775″
Apparent magnitude (V)	15.10
	B
Right ascension	04h 31m 50.6002s
Declination	+24° 24′ 15.503″
Characteristics
HK Tauri A
Evolutionary stage	pre-main-sequence star
Spectral type	M1.5
Apparent magnitude (G)	14.106
Variable type	T Tau
HK Tauri B
Spectral type	M2
Apparent magnitude (G)	17.962
Astrometry
HK Tauri A
Proper motion (μ)	RA: 5.076 mas/yr ; Dec.: −22.944 mas/yr
Parallax (π)	7.6247 ± 0.0317 mas
Distance	428 ± 2 ly ; (131.2 ± 0.5 pc)
HK Tauri B
Proper motion (μ)	RA: 2.668 mas/yr ; Dec.: −20.457 mas/yr
Parallax (π)	7.780 ± 0.6322 mas
Distance	420 ± 30 ly ; (130 ± 10 pc)
Position (relative to HK Tauri A)
Component	HK Tauri B
Angular distance	2.32″
Position angle	170.4°
Projected separation	309 AU
Details
A
Mass	0.44+0.14; −0.11 M☉
Luminosity	0.56 L☉
Temperature	3680±150 K
B
Mass	0.37±0.2 M☉
Luminosity	0.42 L☉
Temperature	3550±150 K
Other designations
	2MASS J04315056+2424180, WISE J043150.56+242417.6
	HK Tauri A: Gaia EDR3 147847072275324416, Gaia DR2 147847072275324416
	HK Tauri B: Gaia EDR3 147847072275766656, Gaia DR2 147847072274696704
Database references
SIMBAD	data

HK Tauri is a young binary star system in the constellation of Taurus about 434 light-years away, belonging to the Taurus Molecular Cloud.

^ Cite error: The named reference Roggero was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference EDR3B was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Manara, C. F.; Tazzari, M.; Long, F.; Herczeg, G. J.; Lodato, G.; Rota, A. A.; Cazzoletti, P.; Van Der Plas, G.; Pinilla, P.; Dipierro, G.; Edwards, S.; Harsono, D.; Johnstone, D.; Liu, Y.; Menard, F.; Nisini, B.; Ragusa, E.; Boehler, Y.; Cabrit, S. (2019), "Observational constraints on dust disk sizes in tidally truncated protoplanetary disks in multiple systems in the Taurus region", Astronomy & Astrophysics, 628: A95, arXiv:1907.03846, Bibcode:2019A&A...628A..95M, doi:10.1051/0004-6361/201935964, S2CID 195847916
^ ^a ^b Akeson, Rachel L.; Jensen, Eric L. N.; Carpenter, John; Ricci, Luca; Laos, Stefan; Nogueira, Natasha F.; Suen-Lewis, Emma M. (2019), "Resolved Young Binary Systems and Their Disks", The Astrophysical Journal, 872 (2): 158, arXiv:1901.05029, Bibcode:2019ApJ...872..158A, doi:10.3847/1538-4357/aaff6a, S2CID 119332907
^ ^a ^b Simon, M.; Guilloteau, S.; Beck, Tracy L.; Chapillon, E.; Folco, E. Di; Dutrey, A.; Feiden, Gregory A.; Grosso, N.; Piétu, V.; Prato, L.; Schaefer, Gail H. (2019), "Masses and Implications for Ages of Low-mass Pre-main-sequence Stars in Taurus and Ophiuchus", The Astrophysical Journal, 884 (1): 42, arXiv:1908.10952, Bibcode:2019ApJ...884...42S, doi:10.3847/1538-4357/ab3e3b, S2CID 201668492

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

[EDR3-2] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference EDR3 was invoked but never defined (see the help page).

[EDR3B-3] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference EDR3B was invoked but never defined (see the help page).

[Manara2019-4] Manara, C. F.; Tazzari, M.; Long, F.; Herczeg, G. J.; Lodato, G.; Rota, A. A.; Cazzoletti, P.; Van Der Plas, G.; Pinilla, P.; Dipierro, G.; Edwards, S.; Harsono, D.; Johnstone, D.; Liu, Y.; Menard, F.; Nisini, B.; Ragusa, E.; Boehler, Y.; Cabrit, S. (2019), "Observational constraints on dust disk sizes in tidally truncated protoplanetary disks in multiple systems in the Taurus region", Astronomy & Astrophysics, 628: A95, arXiv:1907.03846, Bibcode:2019A&A...628A..95M, doi:10.1051/0004-6361/201935964, S2CID 195847916

[Akeson2019-5] Akeson, Rachel L.; Jensen, Eric L. N.; Carpenter, John; Ricci, Luca; Laos, Stefan; Nogueira, Natasha F.; Suen-Lewis, Emma M. (2019), "Resolved Young Binary Systems and Their Disks", The Astrophysical Journal, 872 (2): 158, arXiv:1901.05029, Bibcode:2019ApJ...872..158A, doi:10.3847/1538-4357/aaff6a, S2CID 119332907

[Simon2019-6] Simon, M.; Guilloteau, S.; Beck, Tracy L.; Chapillon, E.; Folco, E. Di; Dutrey, A.; Feiden, Gregory A.; Grosso, N.; Piétu, V.; Prato, L.; Schaefer, Gail H. (2019), "Masses and Implications for Ages of Low-mass Pre-main-sequence Stars in Taurus and Ophiuchus", The Astrophysical Journal, 884 (1): 42, arXiv:1908.10952, Bibcode:2019ApJ...884...42S, doi:10.3847/1538-4357/ab3e3b, S2CID 201668492

[1]

[2]

[3]

[4]

[5]

[6]

Observation data Epoch J2000 Equinox J2000
A light curve for HK Tauri, adapted from Roggero et al. (2021)^[1]
Constellation	Taurus
A
Right ascension	04^h 31^m 50.5716^s^[2]
Declination	+24° 24′ 17.775″^[2]
Apparent magnitude (V)	15.10
B
Right ascension	04^h 31^m 50.6002^s^[3]
Declination	+24° 24′ 15.503″^[3]
Characteristics
HK Tauri A
Evolutionary stage	pre-main-sequence star
Spectral type	M1.5^[4]
Apparent magnitude (G)	14.106^[2]
Variable type	T Tau
HK Tauri B
Spectral type	M2^[4]
Apparent magnitude (G)	17.962^[3]
Astrometry
HK Tauri A
Proper motion (μ)	RA: 5.076^[2] mas/yr Dec.: −22.944^[2] mas/yr
Parallax (π)	7.6247 ± 0.0317 mas^[2]
Distance	428 ± 2 ly (131.2 ± 0.5 pc)
HK Tauri B
Proper motion (μ)	RA: 2.668^[3] mas/yr Dec.: −20.457^[3] mas/yr
Parallax (π)	7.780 ± 0.6322 mas^[3]
Distance	420 ± 30 ly (130 ± 10 pc)
Position (relative to HK Tauri A)^[4]

Component	HK Tauri B
Angular distance	2.32″
Position angle	170.4°
Projected separation	309 AU
Details
A
Mass	0.44^+0.14 _−0.11^[4] `M`_☉
Luminosity	0.56^[5] `L`_☉
Temperature	3680±150^[6] K
B
Mass	0.37±0.2^[4] `M`_☉
Luminosity	0.42^[5] `L`_☉
Temperature	3550±150^[6] K
Other designations
2MASS J04315056+2424180, WISE J043150.56+242417.6
HK Tauri A: Gaia EDR3 147847072275324416, Gaia DR2 147847072275324416
HK Tauri B: Gaia EDR3 147847072275766656, Gaia DR2 147847072274696704
Database references
SIMBAD	data