44 Tauri

44 Tauri

A light curve for IM Tauri, plotted from TESS data.[1] The 3.479 hour period[2] is marked in red.
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]
Distance212 ± 1 ly
(64.9 ± 0.4 pc)
Absolute magnitude (MV)1.44±0.16[6]
Details
Primary
Mass1.89[6] M☉
Surface gravity (log g)3.6±0.1[5] cgs
Temperature7000±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
SIMBADdata

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]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference IVSI was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference dr3 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Lenz2010 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Civelek2001 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Lenz2007 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Danziger1966 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Danziger1967 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Kukarkin1968 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Zima2007 was invoked but never defined (see the help page).