44 Tauri
| Observation data EpochJ2000.0EquinoxJ2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h10m49.86084s[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 ± 0.0863mas[3] |
| Distance | 212 ± 1ly (64.9 ± 0.4pc) |
| Absolute magnitude(MV) | 1.44±0.16[6] |
| Details | |
| Primary | |
| Mass | 1.89[6]M☉ |
| Surface gravity(logg) | 3.6±0.1[5]cgs |
| Temperature | 7000±200[7]K |
| Rotational velocity(vsini) | 2±1[7]km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
44 Tauri,also known asHD 1287andIM Tauri,is a star located about 210light yearsfrom the Earth, in the constellationTaurus.[3]It is a 5thmagnitudestar, making it faintly visible to the naked eye of an observer located far fromcity lights.It is aDelta Scuti variablestar, 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, indicatingbeatphenomena, and they classified it as a δ Scuti variable.[10]In 1968, 44 Tauri was given thevariable star designationIM Tauri.[11]
44 Tauri has been a popular object for detailedastroseismicandspectroscopicstudies, because its very slow (relative to other δ Scuti stars) rotation speed of3±2km/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]
References
[edit]- ^"MAST: Barbara A. Mikulski Archive for Space Telescopes".Space Telescope Science Institute.Retrieved16 January2023.
- ^"IM Tau".The International Variable Star Index.AAVSO.Retrieved19 January2023.
- ^abcdefgVallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData Release 3. Summary of the content and survey properties ".Astronomy and Astrophysics.674:A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID244398875. Gaia DR3 record for this sourceatVizieR.
- ^abcSamus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017)."General catalogue of variable stars: Version GCVS 5.1".Astronomy Reports.61(1): 80.Bibcode:2017ARep...61...80S.doi:10.1134/S1063772917010085.S2CID125853869.
- ^abcdLenz, P.; Pamyatnykh, A. A.; Zdravkov, T.; Breger, M. (January 2010)."A δ Scuti star in the post-MS contraction phase: 44 Tauri"(PDF).Astronomy and Astrophysics.509:A90.arXiv:0911.4339.Bibcode:2010A&A...509A..90L.doi:10.1051/0004-6361/200912914.S2CID119311255.Retrieved19 January2023.
- ^abCivelek, R.; Kızıloğlu, N.; Kırbıyık, H. (October 2001)."Radial and Nonradial Oscillations of 44 Tauri".The Astronomical Journal.122(4): 2042–2046.Bibcode:2001AJ....122.2042C.doi:10.1086/323078.S2CID122087742.
- ^abcLenz, P.; Pamyatnykh, A. A.; Zdravkov, T.; Breger, M. (August 2007)."High-resolution spectroscopy of the δ Scuti star 44 Tauri: photospheric element abundances and mode identification"(PDF).Astronomy and Astrophysics.471(1): 237–245.arXiv:0911.4339.Bibcode:2010A&A...509A..90L.doi:10.1051/0004-6361/200912914.S2CID119311255.Retrieved19 January2023.
- ^"p Tau -- delta Sct Variable".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2023-01-19.
- ^Danziger, I. J.; Dickens, R. J. (August 1966)."Observations of Variable F-Type Stars with Short Periods".Information Bulletin on Variable Stars.150:1.Bibcode:1966IBVS..150....1D.Retrieved19 January2023.
- ^Danziger, I. J.; Dickens, R. J. (July 1967)."Spectrophotometry of New Short-Period Variable Stars".Astrophysical Journal.149:55–72.Bibcode:1967ApJ...149...55D.doi:10.1086/149231.
- ^Kukarkin, B. V.; Efremov, Yu. N.; Frolov, M. S.; Medvedeva, G. I.; Kholopov, P. N.; Kurochkin, N. E.; Kukarkina, N. P.; Perova, N. B.; Fedorovich, V. P. (November 1968)."Identification List of the New Variable Stars Nominated in 1968".Information Bulletin on Variable Stars.311:1.Bibcode:1968IBVS..311....1K.Retrieved19 January2023.
- ^Zima, W.; Lehmann, H.; Stütz, Ch.; Ilyin, I. V.; Breger, M. (August 2007)."High-resolution spectroscopy of the δ Scuti star 44 Tauri: photospheric element abundances and mode identification"(PDF).Astronomy and Astrophysics.471(1): 237–245.Bibcode:2007A&A...471..237Z.doi:10.1051/0004-6361:20077201.Retrieved19 January2023.
