| 词条 | 49 Ceti |
| 释义 |
| image={{Location mark |image=Cetus constellation map.svg|alt=|float=center|width=300 |label=|position=right |mark=Red circle.svg|mark_width=8|mark_link=49 Cet |x=532|y=562 }} |caption=Location of 49 Ceti (circled) }}{{Starbox observe |epoch=J2000 |constell=Cetus |ra={{RA|01|34|37.77884}}[1] |dec={{DEC|-15|40|34.8979}}[1] |appmag_v=5.607[2] }}{{Starbox character |class=A1V[3] |b-v=+0.07[4] |u-b=+0.05[4] }}{{Starbox astrometry |radial_v=10.30 ± 0.7[5] |prop_mo_ra=94.84[1] |prop_mo_dec=-3.14[1] |parallax=16.84 |p_error=0.28 |parallax_footnote=[1] }}{{Starbox detail |source=[6] |mass=2.02 |temperature=8,790 |radius= |rotational_velocity=196 |luminosity=19.12 }}{{Starbox catalog |names={{odlist|BD=-16° 265|HD=9672|HIP=7345|HR=451|SAO=147886}} }}{{Starbox reference |Simbad=49+Cet }}{{Starbox end}}49 Ceti is a star in the constellation of Cetus. Its apparent magnitude is 5.607.[2] It is 194 light-years, or 59.4 parsecs away from the Solar System, based on its parallax.[1] 49 Ceti is a young A-type main-sequence star.[3] It also displays a significant infrared excess, which is a characteristic of a debris disk surrounding the star. Unusually, the disk seems to be gas-rich, with evidence of carbon monoxide (CO) gas. This carbon monoxide gas may possibly be from comets orbiting the star within the disk, similar to the Kuiper Belt in the Solar System.[7] 49 Ceti has been identified as a member of the 40-million-year-old Argus Association.[7] References1. ^1 2 3 4 5 {{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357}} {{Stars of Cetus}}{{main-star-stub}}2. ^1 {{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}} 3. ^1 {{cite journal|bibcode=2013ApJ...771...69R|doi=10.1088/0004-637X/771/1/69|arxiv=1305.2894|title=Herschel Observations of Gas and Dust in the Unusual 49 Ceti Debris Disk|journal=The Astrophysical Journal|volume=771|pages=69|year=2013|last1=Roberge|first1=A.|last2=Kamp|first2=I.|last3=Montesinos|first3=B.|last4=Dent|first4=W. R. F.|last5=Meeus|first5=G.|last6=Donaldson|first6=J. K.|last7=Olofsson|first7=J.|last8=Moór|first8=A.|last9=Augereau|first9=J.-C.|last10=Howard|first10=C.|last11=Eiroa|first11=C.|last12=Thi|first12=W.-F.|last13=Ardila|first13=D. R.|last14=Sandell|first14=G.|last15=Woitke|first15=P.}} 4. ^1 {{cite journal|last1=Rybka|first1=E.|title=The corrected magnitudes and colours of 278 stars near S.A. 1-139 in the UBV system|journal=Acta Astronomica|volume=19|page=229|year=1969|bibcode=1969AcA....19..229R}} 5. ^{{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}} 6. ^{{cite journal|bibcode=2012A&A...537A.120Z|arxiv=1201.2052|title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities|journal=Astronomy & Astrophysics|volume=537|pages=A120|author1=Zorec|first1=J.|last2=Royer|first2=F.|year=2012|doi=10.1051/0004-6361/201117691}} 7. ^1 {{cite journal|bibcode=2012ApJ...758...77Z|doi=10.1088/0004-637X/758/2/77|arxiv=1207.1747|title=A 40 Myr Old Gaseous Circumstellar Disk at 49 Ceti: Massive CO-Rich Comet Clouds at Young A-Type Stars|journal=The Astrophysical Journal|volume=758|issue=2|pages=77|year=2012|last1=Zuckerman|first1=B.|last2=Song|first2=Inseok}} 7 : A-type main-sequence stars|Cetus (constellation)|Flamsteed objects|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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