Beta Doradus

{{Starbox begin

| name = β Doradus

}}

{{Starbox image

| image =

{{Location mark

| image=Dorado constellation map.svg

| float=center | width=260 | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=β Dor

| x=371 | y=738

}}

| caption=Location of β Doradus (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Dorado

| ra = {{RA|05|33|37.51253}}

| dec = {{DEC|−62|29|23.3231}}

| appmag_v = 3.46 to 4.08

}}

{{Starbox character

| class = F4-G4Ia-II

| u-b = +0.55

| b-v = +0.70

| r-i = +0.48

| variable = δ Cephei

}}

{{Starbox astrometry

| radial_v = +7.2

| prop_mo_ra = +0.800

| prop_mo_dec = +9.458

| parallax = 3.14

| p_error = 0.16

| parallax_footnote =

| absmag_v = {{val|−3.91|0.11}}

}}

{{Starbox detail

| mass = {{val|7.7|0.2}}

| rotational_velocity = 0

| radius = {{val|67.8|0.7}}

| temperature = 5,445

| luminosity = 3,200

| gravity = 1.3

| metal_fe = –0.13

| age_myr = {{val|42.5|2.7}}

}}

{{Starbox catalog

| names = {{odlist | B=β Dor, Beta Doradus, Beta Dor | CD=−62 214 | CPD=−62 487 | FK5=212 | GC=6944 | HD=37350 | HIP=26069 | HR=1922 | PPM=354837 | SAO=249311 }}

}}

{{Starbox reference

| Simbad=bet+dor

}}

Beta Doradus, Latinized from β Doradus, is the second brightest star in the southern constellation of Dorado. It is a Classical Cepheid variable, with an apparent magnitude that varies between 3.46 and 4.08. Based upon parallax measurements with the Hubble Space Telescope, it is located at a distance of {{Convert|1040|ly|pc|abbr=off|lk=on}} from Earth.

Characteristics

File:BetaDorLightCurve.png for Beta Doradus, plotted from TESS data]]

Beta Doradus is a Cepheid variable that regularly changes magnitude from a low of 4.08 to a high of 3.46 over a period of 9.84318 days. The light curve of this magnitude change follows a nearly regular saw-tooth pattern, with average amplitude variations period to period about 0.005 magnitude from average amplitude of 0.62 magnitude. During each radial pulsation cycle, the radius of the star varies by {{solar radius|link=y|1=3.9}} around a mean of {{solar radius|67.8}}. Its spectral type and luminosity class are likewise variable, from F-type to G-type and from a supergiant to a bright giant.

Far ultraviolet emissions have been detected from this star with the Far Ultraviolet Spectroscopic Explorer, while X-ray emissions were detected with the XMM-Newton space telescope. The X-ray luminosity is about 1 × 10²⁹ erg/s and the emission varies with the pulsation period, suggesting a connection with the pulsation process. The peak X-ray emissions are in the 0.6–0.8 keV energy range, which occurs for plasmas with temperatures of 7–10 million K.

References

{{Reflist|30em|refs=

{{citation|arxiv=2012.09709|year=2021|title=TESS Observations of Cepheid Stars: First Light Results|doi=10.3847/1538-4365/abd4e3|last1=Plachy|first1=E.|last2=Pál|first2=A.|last3=Bódi|first3=A.|last4=Szabó|first4=P.|last5=Molnár|first5=L.|last6=Szabados|first6=L.|last7=Benkő|first7=J. M.|last8=Anderson|first8=R. I.|last9=Bellinger|first9=E. P.|last10=Bhardwaj|first10=A.|last11=Ebadi|first11=M.|last12=Gazeas|first12=K.|last13=Hambsch|first13=F.-J.|last14=Hasanzadeh|first14=A.|last15=Jurkovic|first15=M. I.|last16=Kalaee|first16=M. J.|last17=Kervella|first17=P.|last18=Kolenberg|first18=K.|last19=Mikołajczyk|first19=P.|last20=Nardetto|first20=N.|last21=Nemec|first21=J. M.|last22=Netzel|first22=H.|last23=Ngeow|first23=C.-C.|last24=Ozuyar|first24=D.|last25=Pascual-Granado|first25=J.|last26=Pilecki|first26=B.|last27=Ripepi|first27=V.|last28=Skarka|first28=M.|last29=Smolec|first29=R.|last30=Sódor|first30=Á.|journal=The Astrophysical Journal Supplement Series|volume=253|issue=1 |page=11|bibcode=2021ApJS..253...11P |s2cid=229297708|display-authors=1 |doi-access=free }}

{{citation | display-authors=1 | last1=Benedict | first1=G. Fritz | last2=McArthur | first2=Barbara E. | last3=Feast | first3=Michael W. | last4=Barnes | first4=Thomas G. | last5=Harrison | first5=Thomas E. | last6=Patterson | first6=Richard J. | last7=Menzies | first7=John W. | last8=Bean | first8=Jacob L. | last9=Freedman | first9=Wendy L. |date=April 2007 | bibcode=2007AJ....133.1810B | title=Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations | journal=Astronomical Journal | volume=133 | issue=4 | pages=1810–1827 | doi=10.1086/511980 | postscript=. |arxiv = astro-ph/0612465 | s2cid=16384267 }}

{{cite web |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=8 December 2021}}

{{citation | last=Evans | first=D. S. | date=June 20–24, 1966 | editor1-last=Batten | editor1-first=Alan Henry | editor2-last=Heard | editor2-first=John Frederick | title=The Revision of the General Catalogue of Radial Velocities | work=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | volume=30 | page=57 | location=University of Toronto | publisher=International Astronomical Union | bibcode=1967IAUS...30...57E }}

{{citation | last1=Turner | first1=D. G. | title=The reddening of Beta Doradus | journal=Journal of the Royal Astronomical Society of Canada | volume=74 | pages=64–69 |date=April 1980 | bibcode=1980JRASC..74...64T }}

{{citation | last1=Taylor | first1=Melinda M. | last2=Booth | first2=Andrew J. | title=The bright southern Cepheid beta Doradus: the radial velocity curve, distance and size | journal=Monthly Notices of the Royal Astronomical Society | volume=298 | issue=2 | pages=594–600 |date=August 1998 | doi=10.1046/j.1365-8711.1998.01670.x | bibcode=1998MNRAS.298..594T | doi-access=free }}

{{citation | last1=Turner | first1=David G. | title=The PL calibration for Milky Way Cepheids and its implications for the distance scale | journal=Astrophysics and Space Science | volume=326 | issue=2 | pages=219–231 |date=April 2010 | doi=10.1007/s10509-009-0258-5 | bibcode=2010Ap&SS.326..219T |arxiv = 0912.4864 | s2cid=119264970 }}

{{citation | display-authors=1 | last1=Romaniello | first1=M. | last2=Primas | first2=F. | last3=Mottini | first3=M. | last4=Pedicelli | first4=S. | last5=Lemasle | first5=B. | last6=Bono | first6=G. | last7=François | first7=P. | last8=Groenewegen | first8=M. A. T. | last9=Laney | first9=C. D. | title=The influence of chemical composition on the properties of Cepheid stars. II. The iron content | journal=Astronomy and Astrophysics | volume=488 | issue=2 | pages=731–747 |date=September 2008 | doi=10.1051/0004-6361:20065661 | bibcode=2008A&A...488..731R |arxiv = 0807.1196 | s2cid=16955805 }}

{{citation | display-authors=1 | last1=Engle | first1=Scott G. | last2=Guinan | first2=Edward F. | last3=Depasquale | first3=Joseph | last4=Evans | first4=Nancy | contribution=The Secret XUV Lives of Cepheids: FUV/X-ray observations of Polaris and β Dor | title=Future Directions in Ultraviolet Spectroscopy: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission | series=AIP Conference Proceedings | volume=1135 | pages=192–197 |date=May 2009 | doi=10.1063/1.3154048 | bibcode=2009AIPC.1135..192E |arxiv = 0902.3449 | s2cid=16635363 }}

{{citation | url=http://stars.astro.illinois.edu/sow/betador.html | access-date=2012-01-01 | title=Beta Doradus | work=Stars | publisher=University of Illinois | first1=James B. | last1=Kaler }}

bet Dor, database entry, [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars] {{Webarchive|url=https://web.archive.org/web/20170620004609/http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat |date=2017-06-20 }}, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 9, 2008.

[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=1922 HR 1922], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line September 9, 2008.

{{citation | 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 | doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T |arxiv = 1007.4883 | s2cid=118629873 }}

}}

Category:F-type supergiants

Category:Classical Cepheid variables