BF Orionis - Misplaced Pages

Young protostar system

BF Orionis
Observation data Epoch J2000 Equinox J2000
A visual band light curve For BF Orionis, adapted from Grinin et al. (2010)
Constellation	Orion
Right ascension	05 37 13.2624
Declination	−06° 35′ 00.5654″
Apparent magnitude (V)	9.69
Characteristics
Evolutionary stage	Herbig Ae/Be star
Spectral type	A5II-III
Apparent magnitude (g)	10.38
Astrometry

Proper motion (μ)	RA: 0.873±0.025 mas/yr Dec.: 0.654±0.023 mas/yr
Parallax (π)	2.6173 ± 0.0279 mas
Distance	1,250 ± 10 ly (382 ± 4 pc)

Details

Mass	1.85 _−0.00 `M`_☉
Radius	1.59±0.20 `R`_☉
Luminosity	39 `L`_☉
Surface gravity (log g)	3.5 cgs
Temperature	8750 K
Rotational velocity (v sin i)	37±2 km/s
Age	17.14 _−0.00 Myr

Other designations
BD-06 1259, GSC 04778-01087, HIP 26403, 2MASS J05371326-0635005, Gaia DR2 3016930993175537536, Gaia EDR3 3016930993175889792, TYC 4778-1087-1
Database references
SIMBAD	data

BF Orionis is a young Herbig Ae/Be star in the constellation of Orion about 1250 light years away, within the Orion Nebula. It is the most massive star of the small birth cluster of four stars.

Properties

BF Orionis is a Herbig Ae/Be star variable similar to UX Orionis. It is still accreting mass, producing about 2L_☉ through the release of gravitational energy, and is surrounded by a massive, optically thick protoplanetary disk of 0.005±0.002M_☉ visible nearly edge-on. The brightness of the star is strongly variable, with irregular deep minima down to 13th magnitude. The variations are suspected to be partly caused by a brown dwarf or massive planet embedded in the protoplanetary disk, together with very large comets.

Unlike typical Herbig Ae/Be stars, 90-95% of which do not have detectable magnetic fields, BF Orionis has a fairly strong longitudinal magnetic field of −144±21 gauss. It also has small (0.11 magnitude) short-period, single-mode pulsations of the Delta Scuti type.

References

^ Grinin, V. P.; Rostopchina, A. N.; Barsunova, O. Yu.; Demidova, T. V. (2010). "Mechanism for cyclical activity of the Herbig Ae star BF Ori". Astrophysics. 53 (3): 367–372. Bibcode:2010Ap.....53..367G. doi:10.1007/s10511-010-9128-7. S2CID 56017726.
^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ Wade, G. A.; Bagnulo, S.; Drouin, D.; Landstreet, J. D.; Monin, D. (2007). "A search for strong, ordered magnetic fields in Herbig Ae/Be stars". Monthly Notices of the Royal Astronomical Society. 376 (3): 1145–1161. arXiv:astro-ph/0701387. Bibcode:2007MNRAS.376.1145W. doi:10.1111/j.1365-2966.2007.11495.x. S2CID 14156014.
^ Guzmán-Díaz, J.; Mendigutía, I.; Montesinos, B.; Oudmaijer, R. D.; Vioque, M.; Rodrigo, C.; Solano, E.; Meeus, G.; Marcos-Arenal, P. (2021), "Homogeneous study of Herbig Ae/Be stars from spectral energy distributions and Gaia EDR3", Astronomy & Astrophysics, 650: A182, arXiv:2104.11759, Bibcode:2021A&A...650A.182G, doi:10.1051/0004-6361/202039519, S2CID 233393918
Grinin, V. P.; Kozlova, O. V.; Natta, A.; Ilyin, I.; Tuominen, I.; Rostopchina, A. N.; Shakhovskoy, D. N. (2001). "Optical spectra of five UX Orionis-type stars". Astronomy and Astrophysics. 379 (2): 482. Bibcode:2001A&A...379..482G. doi:10.1051/0004-6361:20011280. S2CID 121844237.
^ Mora, A.; Eiroa, C.; Natta, A.; Grady, C. A.; De Winter, D.; Davies, J. K.; Ferlet, R.; Harris, A. W.; Miranda, L. F.; Montesinos, B.; Oudmaijer, R. D.; Palacios, J.; Quirrenbach, A.; Rauer, H.; Alberdi, A.; Cameron, A.; Deeg, H. J.; Garzón, F.; Horne, K.; Merín, B.; Penny, A.; Schneider, J.; Solano, E.; Tsapras, Y.; Wesselius, P. R. (2004). "Dynamics of the circumstellar gas in the Herbig Ae stars BF Orionis, SV Cephei, WW Vulpeculae and XY Persei". Astronomy & Astrophysics. 419: 225–240. arXiv:astro-ph/0402614. Bibcode:2004A&A...419..225M. doi:10.1051/0004-6361:20040096. S2CID 17149403.
Testi, L.; Palla, F.; Natta, A. (1998). "The onset of cluster formation around Herbig Ae/Be stars". arXiv:astro-ph/9811210.
Shevchenko, V. S.; Ezhkova, O. V. (2001). "Long-Term Cyclicity of the Herbig Ae Star BF Ori: Giant Protocomets and Accretion from a Protoplanetary Disk". Astronomy Letters. 27 (1): 39. Bibcode:2001AstL...27...39S. doi:10.1134/1.1336861. S2CID 121443217.
Marconi, M.; Ripepi, V.; Alcala', J. M.; Covino, E.; Palla, F.; Terranegra, L. (2000). "Pulsation in two Herbig Ae stars: HD 35929 and V351 Ori". Astronomy and Astrophysics. 355. arXiv:astro-ph/0002466. Bibcode:2000A&A...355L..35M.

Constellation of Orion

Stars

Bayer	α (Betelgeuse) β (Rigel) γ (Bellatrix) δ (Mintaka) ε (Alnilam) ζ (Alnitak) η (Algjebba) θ A B C D E F G H θ ι (Hatysa) κ (Saiph) λ (Meissa) μ ν ξ ο ο π π π (Tabit) π π π ρ σ τ υ (Thabit) φ φ χ χ ψ ψ ω
Flamsteed	5 6 (g) 11 13 14 (i) 15 16 (h) 18 21 22 (o) 23 (m) 27 (p) 29 (e) 31 32 (A) 33 35 38 42 (c) 45 49 (d) 51 (b) 52 55 56 57 59 60 63 64 66 68 69 (f) 71 72 (f) 73 74 (k) 75 (l)
Variable	S U W UX VV BF BM DN FU GW V380 V883 V1005 V1149 V1201 V1352 V2247 V2254 V2384
HR	1759 1763 1874 1887 1952 1988 2007 2024 2251 2275
HD	33636 34445 37320 37605 42618 43317 290327
Other	4U 0614+091 CVSO 30 CWISE J0506+0738 Gliese 179 Gliese 205 Gliese 208 Gliese 221 GJ 3379 HOPS 383 LP 658-2 PDS 110 S Ori 52 S Ori 70 WISE J0457−0207 WISE J0521+1025

Exoplanets	HD 34445 b HD 37605 b HD 38529 b HD 290327 b

Star
clusters

NGC	1662 1980 1981 2169 2175 2194 2202
Other	Lambda Orionis Cluster Trapezium Cluster (θ)

Nebulae

NGC	1788 1999 2022 2023 2064 2067 2071 2174
Other	Abell 12 Abell 13 Barnard 30 Becklin–Neugebauer Object Flame Nebula HH 1/2 HH 24-26 HH 34 HH 111 Horsehead Nebula IC 434 IC 2118 LDN 1641 McNeil's Nebula Messier 43 Messier 78 Orion Nebula

Galaxies

NGC	1683 1819 1924 2110 2119
Other	4C +09.17 CGCG 396-2 II Zwicky 28 PKS 0458-020 PKS 0528+134 TXS 0506+056

Astronomical events	GRB 991216