View source for Astronomy:HD 28375

{{Short description|Star in the constellation Taurus}}
{{Starbox begin}}
{{Starbox image
 | image = 
{{Location mark
|image=Taurus constellation map.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=8|mark_link=HD 28375
|x=551|y=961
}}
 | caption = Location of HD 28375 (circled)
}}
{{Starbox observe
 | epoch       = [[Astronomy:J2000|J2000]]
 | constell    = [[Astronomy:Taurus (constellation)|Taurus]]
 | ra          = {{RA|04|28|32.12178}}<ref name=GaiaDR2/>
 | dec         = {{DEC|+01|22|50.9687}}<ref name=GaiaDR2/>
 | appmag_v    = 5.53<ref name=Anderson2012/>
}}
{{Starbox character
 | type        = 
 | class       = B3V<ref name=Liu/>
 | b-v         = {{Val|-0.099|0.008}}<ref name=Anderson2012/>
 | u-b         = -0.55<ref name=UBVRI/>
 | variable    = 
}}
{{Starbox astrometry
 | radial_v    = {{Val|18.0|4.3}}<ref name=RV/>
 | prop_mo_ra  = +19.530<ref name=GaiaDR2/>
 | prop_mo_dec = −20.272<ref name=GaiaDR2/>
 | parallax    = 6.8102
 | p_error     = 0.1690
 | parallax_footnote = <ref name=GaiaDR2/>
 | absmag_v    = 0.19<ref name=Anderson2012/>
}}
{{Starbox detail
 | mass        = {{Val|5.0|0.1}}<ref name=Tetzlaff2011/>
 | radius      = 
 | temperature = 13,000<ref name=Liu/>
 | luminosity  = 126.75<ref name=Anderson2012/>
 | gravity     = 4<ref name=Liu/>
 | metal_fe    = {{Val|0.05|0.06}}<ref name=gaspar2016/>
 | rotational_velocity = {{Val|13|3}}<ref name=Braganca/>
 | age_myr     = {{Val|3.1|2.1}}<ref name=Tetzlaff2011/>
}}
{{Starbox catalog
 | names = {{odlist | BD=+01°757 | FK5=1123 | HD=28375 | HIP=20884 | HR=1415 | SAO=111845 | GC=5441 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad = HD+28375
}}
{{Starbox end}}

'''HD 28375''' is a single<ref name=Eggleton2008/> [[Astronomy:Star|star]] in the [[Celestial equator|equatorial]] [[Astronomy:Constellation|constellation]] of [[Astronomy:Taurus (constellation)|Taurus]], near the southern constellation border with [[Astronomy:Eridanus (constellation)|Eridanus]]. It was previously known by the [[Astronomy:Flamsteed designation|Flamsteed designation]] '''44 Eridani''', although the name has fallen out of use because constellations were redrawn, placing the star out of Eridanus and into Taurus. The star is blue-white in hue and is dimly visible to the naked eye with an [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] of 5.53.<ref name=Anderson2012/> The distance to this star is approximately 480&nbsp;[[Astronomy:Light-year|light-year]]s based on [[Astronomy:Stellar parallax|parallax]].<ref name=GaiaDR2/> It is drifting further away with a [[Astronomy:Radial velocity|radial velocity]] of 18&nbsp;km/s,<ref name=RV/> after having come to within an estimated {{Convert|76.31|pc|ly|0|disp=out|abbr=off}} some 3.7&nbsp;million years ago.<ref name=Anderson2012/>

Cowley (1972) and later Bragança et al. (2012) found a [[Astronomy:Stellar classification|stellar classification]] of B3V<ref name=Cowley1972/><ref name=Braganca2012/> for this object, matching a [[Astronomy:B-type main-sequence star|B-type main-sequence star]]. Houk and Swift assigned it a class of B5&nbsp;III/IV,<ref name=Houk1999/> suggesting it is a more [[Astronomy:Stellar evolution|evolved]] star that is entering the [[Astronomy:Giant star|giant stage]]. It has five times the mass of the Sun and is around three million years old,<ref name=Tetzlaff2011/> with a projected rotational velocity of just 13&nbsp;km/s.<ref name=Braganca/> The star is radiating 127<ref name=Anderson2012/> times the luminosity of the Sun from its [[Astronomy:Photosphere|photosphere]] at an [[Astronomy:Effective temperature|effective temperature]] of about 13,000&nbsp;K.<ref name=Liu/>

An [[Astronomy:Infrared excess|infrared excess]] has been detected, indicating the presence of a circumstellar disk. The dust has a temperature of about 119&nbsp;K and is orbiting {{Val|67|ul=AU}} from the [[Astronomy:Star|star]].<ref name=Liu/>

==References==
{{reflist|refs=

<ref name=SIMBAD>{{cite simbad | title=HD 28375 | access-date=2019-12-18 }}</ref>

<ref name=GaiaDR2>{{Cite Gaia DR2|3278970486957732224}}</ref>

<ref name=Anderson2012>{{citation
 | title=XHIP: An extended hipparcos compilation
 | last1=Anderson | first1=E. | last2=Francis | first2=Ch.
 | journal=Astronomy Letters
 | volume=38 | issue=5 | pages=331 | year=2012
 | bibcode=2012AstL...38..331A | arxiv=1108.4971
 | doi=10.1134/S1063773712050015 | s2cid=119257644 | postscript=. }}</ref>

<ref name=Eggleton2008>{{citation
 | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
 | title=A catalogue of multiplicity among bright stellar systems
 | journal=[[Organization:Monthly Notices of the Royal Astronomical Society|Monthly Notices of the Royal Astronomical Society]]
 | volume=389 | issue=2 | pages=869–879 | date=September 2008
 | doi=10.1111/j.1365-2966.2008.13596.x | arxiv=0806.2878
 | bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}</ref>

<ref name=gaspar2016>{{citation
 | display-authors=1 | last1=Gáspár | first1=András
 | last2=Rieke | first2=George H. | last3=Ballering | first3=Nicholas
 | title=The Correlation between Metallicity and Debris Disk Mass
 | journal=The Astrophysical Journal | postscript=.
 | volume=826 | issue=2 | pages=171 | year=2016
 | bibcode=2016ApJ...826..171G | arxiv=1604.07403
 | doi=10.3847/0004-637X/826/2/171 | s2cid=119241004 | doi-access=free }}</ref>

<ref name=Tetzlaff2011>{{citation
 | display-authors=1 | last1=Tetzlaff | first1=N.
 | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M.
 | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun
 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=410 | issue=1 | pages=190–200 | date=January 2011
 | bibcode=2011MNRAS.410..190T | arxiv=1007.4883
 | doi=10.1111/j.1365-2966.2010.17434.x | s2cid=118629873 }}</ref>

<ref name=Houk1999>{{citation
 | last1=Houk | first1=N. | last2=Swift | first2=C.
 | title=Michigan catalogue of two-dimensional spectral types for the HD Stars
 | journal=Michigan Spectral Survey
 | volume=5 | year=1999 | bibcode=1999MSS...C05....0H }}</ref>

<ref name=Cowley1972>{{citation
 | last1=Cowley | first1=A.
 | title=Spectral classification of the bright B8 stars
 | journal=Astronomical Journal
 | volume=77 | pages=750–755 | date=November 1972
 | doi=10.1086/111348 | bibcode=1972AJ.....77..750C
 | postscript=. }}</ref>

<ref name=Braganca2012>{{citation | display-authors=1
 | title=Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk
 | last1=Bragança | first1=G. A. | last2=Daflon | first2=S.
 | last3=Cunha | first3=K. | last4=Bensby | first4=T.
 | last5=Oey | first5=M. S. | last6=Walth | first6=G.
 | journal=The Astronomical Journal | date=November 2012
 | volume=144 | issue=5 | id=130 | pages=10
 | doi=10.1088/0004-6256/144/5/130 | bibcode=2012AJ....144..130B
 | arxiv=1208.1674 | s2cid=118868235
 | postscript=. }}</ref>

<ref name=Liu>{{cite journal|bibcode=2014AJ....148....3L|doi=10.1088/0004-6256/148/1/3|arxiv=1308.5593|title=Bright Debris Disk Candidates Detected with Theakari/far-Infrared Surveyor|journal=The Astronomical Journal|volume=148|pages=3|year=2014|last1=Liu|first1=Qiong|last2=Wang|first2=Tinggui|last3=Jiang|first3=Peng|issue=1|s2cid=117353888}}</ref>

<ref name=UBVRI>{{cite journal|title=UBVRIJKL Photometry of the Bright Stars|author1=Johnson, H. L.|journal=Communications of the Lunar and Planetary Laboratory|volume=4|pages=99|date=1966|bibcode=1966CoLPL...4...99J}}</ref>

<ref name=RV>{{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053|s2cid=119231169}}</ref>

<ref name=Braganca>{{cite journal|bibcode=2012AJ....144..130B|doi=10.1088/0004-6256/144/5/130|arxiv=1208.1674|title=Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk|journal=The Astronomical Journal|volume=144|issue=5|pages=130|year=2012|last1=Bragança|first1=G. A.|last2=Daflon|first2=S.|last3=Cunha|first3=K.|last4=Bensby|first4=T.|last5=Oey|first5=M. S.|last6=Walth|first6=G.|s2cid=118868235}}</ref>

}}

{{Stars of Taurus}}
<!-- Properties -->
{{DEFAULTSORT:HD 28375}}
[[Category:B-type main-sequence stars]]
[[Category:Circumstellar disks]]
<!-- Identifiers -->
[[Category:Taurus (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Flamsteed objects|Eridani, 44]]
[[Category:Henry Draper Catalogue objects|028375]]
[[Category:Hipparcos objects|020884]]
[[Category:Bright Star Catalogue objects|1415]]

{{Sourceattribution|HD 28375}}