44 Tauri
{{short description|Variable star in the constellation Taurus}}
{{About-distinguish|p Tauri|ρ Tauri}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = A light curve for IM Tauri, plotted from TESS data. The 3.479 hour period is marked in red.
}}
{{Starbox observe
| epoch = J2000.0
| dec = {{DEC|+26|28|51.4365}}
| constell = Taurus
}}
{{Starbox character
| b-v =
| u-b =
| variable = δ Scuti
}}
{{Starbox astrometry
| radial_v = {{val|17.43|0.64}}
| prop_mo_ra = {{val|-30.919|0.123}}
| prop_mo_dec = {{val|-35.105|0.072}}
| parallax = 15.4199
| p_error = 0.0863
| absmag_v = {{val|1.44|0.16}}
}}
{{Starbox detail
| source =
| component1 = Primary
| radius =
| luminosity =
| temperature = {{val|7000|200}}
| metal_fe =
| rotational_velocity = {{val|2|1}}
| rotation =
| age_gyr =
}}
{{Starbox catalog
| names = p Tauri, IM Tauri, BD+26 411, HIP 19513, HD 26322, HR 1287, SAO 76485
}}
{{Starbox reference
| Simbad = IM+Tau
}}
{{Starbox end}}
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. 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.
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. 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. In 1968, 44 Tauri was given the variable star designation IM Tauri.
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 {{val|3|2}} km/sec does not complicate pulsation mode identification or greatly broaden spectral lines. As of 2010, 44 Tauri had been found to pulsate with 15 independent periods, ranging from 1.89 to 4.52 hours.
References
{{Reflist|30em|refs=
| title=IM Tau
| url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=35247
| website=The International Variable Star Index | publisher=AAVSO | access-date=19 January 2023}}
| title=MAST: Barbara A. Mikulski Archive for Space Telescopes
| url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html
| publisher=Space Telescope Science Institute |access-date=16 January 2023}}
{{cite Gaia DR3|162405533940990080}}
| bibcode=2017ARep...61...80S
| title=General catalogue of variable stars: Version GCVS 5.1
| last1=Samus' | first1=N. N. | last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| journal=Astronomy Reports | year=2017 | volume=61 | issue=1 | page=80
| doi=10.1134/S1063772917010085 | s2cid=125853869 | doi-access=free }}
| title=p Tau -- delta Sct Variable | access-date=2023-01-19}}
| last1=Danziger | first1=I. J. | last2=Dickens | first2=R. J. | bibcode=1966IBVS..150....1D
| title=Observations of Variable F-Type Stars with Short Periods
| journal=Information Bulletin on Variable Stars | date=August 1966 | volume=150
| page=1 | url=https://ui.adsabs.harvard.edu/abs/1966IBVS..150....1D | access-date=19 January 2023}}
| last1=Danziger | first1=I. J. | last2=Dickens | first2=R. J.
| title=Spectrophotometry of New Short-Period Variable Stars
| journal=Astrophysical Journal | date=July 1967 | volume=149 | pages=55–72
| doi=10.1086/149231 | bibcode=1967ApJ...149...55D
| doi-access=free }}
| last1=Kukarkin | first1=B. V. | last2=Efremov | first2=Yu. N. | last3=Frolov
| first3=M. S. | last4=Medvedeva | first4=G. I. | last5=Kholopov | first5=P. N.
| last6=Kurochkin | first6=N. E. | last7=Kukarkina | first7=N. P. | last8=Perova
| first8=N. B. | last9=Fedorovich | first9=V. P. | bibcode=1968IBVS..311....1K
| title=Identification List of the New Variable Stars Nominated in 1968
| journal=Information Bulletin on Variable Stars | date=November 1968 | volume=311
| page=1 | url=https://ui.adsabs.harvard.edu/abs/1968IBVS..311....1K | access-date=19 January 2023}}
| last1=Lenz | first1=P. | last2=Pamyatnykh | first2=A. A.
| last3=Zdravkov | first3=T. | last4=Breger | first4=M.
| title=A δ Scuti star in the post-MS contraction phase: 44 Tauri
| journal=Astronomy and Astrophysics | date=January 2010 | volume=509
| pages=A90 | doi=10.1051/0004-6361/200912914 | arxiv=0911.4339 | bibcode=2010A&A...509A..90L
| s2cid=119311255 | url=https://www.aanda.org/articles/aa/pdf/2010/01/aa12914-09.pdf | access-date=19 January 2023}}
| last1=Lenz | first1=P. | last2=Pamyatnykh | first2=A. A.
| last3=Zdravkov | first3=T. | last4=Breger | first4=M.
| title=High-resolution spectroscopy of the δ Scuti star 44 Tauri: photospheric element abundances and mode identification
| journal=Astronomy and Astrophysics | date=August 2007 | volume=471 | issue=1 | pages=237–245
| doi=10.1051/0004-6361/200912914 | arxiv=0911.4339 | bibcode=2010A&A...509A..90L
| s2cid=119311255 | url=https://www.aanda.org/articles/aa/pdf/2010/01/aa12914-09.pdf | access-date=19 January 2023}}
| last1=Zima | first1=W. | last2=Lehmann | first2=H.
| last3=Stütz | first3=Ch. | last4=Ilyin | first4=I. V. | last5=Breger | first5=M.
| title=High-resolution spectroscopy of the δ Scuti star 44 Tauri: photospheric element abundances and mode identification
| journal=Astronomy and Astrophysics | date=August 2007 | volume=471 | issue=1 | pages=237–245
| doi=10.1051/0004-6361:20077201 | bibcode=2007A&A...471..237Z
| url=https://www.aanda.org/articles/aa/pdf/2007/31/aa7201-07.pdf | access-date=19 January 2023}}
| last1=Civelek | first1=R. | last2=Kızıloğlu | first2=N.
| last3=Kırbıyık | first3=H.
| title=Radial and Nonradial Oscillations of 44 Tauri
| journal=The Astronomical Journal | date=October 2001 | volume=122 | issue=4 | pages=2042–2046
| doi=10.1086/323078 | bibcode=2001AJ....122.2042C
| s2cid=122087742 | doi-access=free }}
}}
{{Stars of Taurus}}
{{DEFAULTSORT:HD 25558}}
Category:Taurus (constellation)
Category:Durchmusterung objects