HD 283572
Young star in constellation Taurus
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HD 283572 is a young T Tauri-type pre-main sequence star in the constellation of Taurus about 414 light years away, belonging to the Taurus Molecular Cloud.[5] It is a rather evolved protostar which already dispersed its birth shroud.[6] The star emits a very high X-ray flux of 1031 ergs/s. That radiation flux associated with the magnetic activity induced a high coronal temperature of 3 keV and regular flares.[8] HD 283572 will eventually evolve to an A-type main-sequence star when on the main sequence.[5] It is no longer accreting mass, and is magnetically decoupled from the remnants of the protoplanetary disk,[5] belonging to the terminal, 3rd phase of the disk evolution.[9] Submillimeter Array (SMA) 1.3mm observations of HD 283572 detected an extreme brightening event with a radio luminosity of 8.3×1016 erg/s/Hz that spanned 9 hours on January 17th 2022.[10][11] Although HD 283572 was observed by the SMA on 8 separate nights, millimeter emission was detected on one night only, strongly suggesting stellar variability as a result of an extreme stellar flare.[10][11]
A combined y band (near-infrared) and visual band light curve for V987 Tauri, adapted from Strassmeier and Rice (1998)[1] | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Taurus[2] |
| Right ascension | 04h 21m 58.8485s[3] |
| Declination | +28° 18′ 06.513″[3] |
| Apparent magnitude (V) | 8.87 – 9.1[4] |
| Characteristics | |
| Evolutionary stage | pre-main-sequence star[5] |
| Spectral type | G5[6] |
| Apparent magnitude (B) | 9.80[7] |
| Apparent magnitude (G) | 8.80[7] |
| Apparent magnitude (R) | 9.14[7] |
| Apparent magnitude (J) | 7.414[7] |
| Variable type | T Tau[6] |
| Astrometry | |
| Radial velocity (Rv) | 15.0±1.5[6] km/s |
| Proper motion (μ) | RA: 8.837±0.027 mas/yr[3] Dec.: −26.426±0.017 mas/yr[3] |
| Parallax (π) | 7.8735±0.0190 mas[3] |
| Distance | 414.2 ± 1.0 ly (127.0 ± 0.3 pc) |
| Details | |
| Mass | 1.6[6] M☉ |
| Radius | 2.2[6] R☉ |
| Luminosity | 5.5[6] L☉ |
| Temperature | 5,770[6] K |
| Metallicity [Fe/H] | 0.7±0.2[5] dex |
| Rotation | 1.55 d[5] |
| Rotational velocity (v sin i) | 78[5] km/s |
| Age | 9[6] Myr |
| Other designations | |
| V987 Tauri, BD+27 657, HD 283572, HIP 20388, TYC 1828-481-1, GSC 01828-00481, 2MASS J04215884+2818066[7] | |
| Database references | |
| SIMBAD | data |
In 1987, Frederick M. Walter et al. announced that HD 283572 is a variable star.[12] It was given its variable star designation, V987 Tauri, in 1989.[13]
Protoplanetary system
HD 283572 is surrounded by a light (<0.0004 M☉) and faint protoplanetary disk with uncertain inclination. Different instruments yielded measurements of disk inclination to the plane of sky from 35 to 60 degrees.[9] A search for planetary transits was performed but no planets were detected as of 2019.[14]