Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Taurus |
Right ascension | 04h 10m 49.86084s [3] |
Declination | +26° 28′ 51.4365″ [3] |
Apparent magnitude (V) | 5.37 - 5.58 [4] |
Characteristics | |
Spectral type | F2 IV [5] |
Variable type | δ Scuti [4] |
Astrometry | |
Radial velocity (Rv) | 17.43±0.64 [3] km/s |
Proper motion (μ) | RA: −30.919±0.123 [3] mas/yr Dec.: −35.105±0.072 [3] mas/yr |
Parallax (π) | 15.4199±0.0863 mas [3] |
Distance | 212 ± 1 ly (64.9 ± 0.4 pc) |
Absolute magnitude (MV) | 1.44±0.16 [6] |
Details | |
Primary | |
Mass | 1.89 [6] M☉ |
Surface gravity (log g) | 3.6±0.1 [5] cgs |
Temperature | 7000±200 [7] K |
Rotational velocity (v sin i) | 2±1 [7] km/s |
Other designations | |
p Tauri, IM Tauri, BD+26 411, HIP 19513, HD 26322, HR 1287, SAO 76485 [8] | |
Database references | |
SIMBAD | data |
44 Tauri, also known as HD 1287 and IM Tauri, is a star located about 210 light years from the Earth, in the constellation Taurus. [3] It is a 5th magnitude star, making it faintly visible to the naked eye of an observer located far from city lights. It is a Delta Scuti variable star, ranging between magnitude 5.37 and 5.58 over a period of about 3.5 hours. [4]
In 1966, Ivan Danziger and Robert Dickens discovered that 44 Tauri was a low amplitude variable star, with a period of approximately 3.22 hours. [9] In a follow-up study published the next year, they reported that the period was irregular, indicating beat phenomena, and they classified it as a δ Scuti variable. [10] In 1968, 44 Tauri was given the variable star designation IM Tauri. [11]
44 Tauri has been a popular object for detailed astroseismic and spectroscopic studies, because its very slow (relative to other δ Scuti stars) rotation speed of 3±2 km/sec does not complicate pulsation mode identification or greatly broaden spectral lines. [5] [7] [12] As of 2010, 44 Tauri had been found to pulsate with 15 independent periods, ranging from 1.89 to 4.52 hours. [5]