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词条 EPIC 204278916
释义

  1. Luminosity

  2. See also

  3. References

{{Use dmy dates|date=September 2016}}{{Starbox begin
| name = EPIC 204278916{{Starbox observe
| epoch = J2000.0 (ICRS)
| constell = Scorpius
| ra = {{RA|16|02|07.576}}[1]
| dec = {{DEC|-22|57|46.89}}[1]
| appmag_v = {{Starbox character
| type = Pre-main-sequence
| class = M1[2]
| appmag_1_passband = R
| appmag_1 = 13.7[3]
| r-i =
| v-r =
| b-v =
| u-b =
| j-h = 0.712
| j-k = 1.033{{Starbox astrometry
| prop_mo_ra = {{val|-13.5|8.7}}[2]
| prop_mo_dec = {{val|-20.0|8.8}}[2]
| parallax =
| p_error =
| parallax_footnote =
| dist_ly =
| dist_pc =
| absmag_v ={{Starbox detail
| mass = 0.5[7]
| radius = 0.97[7]
| luminosity_bolometric = 0.15[3]
| temperature = 3,673[3]
| age_myr = ≈5[7]{{Starbox catalog
| names = 2MASS J16020757-2257467, UCAC2 22721863, USNO-B1.0 0670-00406583{{Starbox reference
| Simbad = 2MASS+J16020757-2257467{{Starbox end}}EPIC 204278916 is a pre-main-sequence star, about five million years old with a spectral type of M1, implying a red dwarf. It is part of the Upper Scorpius sub-group of the Scorpius–Centaurus Association, and is in the constellation Scorpius. The star is approximately the size of the Sun at {{solar radius|0.97}}, but is only half its mass ({{solar mass|0.50}}) and a fraction of its luminosity ({{solar luminosity|0.15}}).[4]

This stellar object was first characterized by the 2nd USNO CCD Astrograph Catalog and the Two Micron All-Sky Survey,[1][5] and was further studied during the Kepler space telescope's extended K2 mission Campaign 2 between 23 August and 13 November 2014.

Luminosity

In August 2016, a team of astronomers, led by Simone Scaringi of the Max Planck Institute for Extraterrestrial Physics in Germany, reported that this red dwarf star has a resolved circumstellar disc. Further, the research team observed unusual luminosity dimmings of up to 65% for 25 consecutive days (out of 79 total observation days). The variability in luminosity was highly periodic and attributed to stellar rotation. The researchers hypothesized that the irregular dimmings were caused by either a warped inner-disk edge or transiting cometary-like objects in either circular or eccentric orbits.[4]

See also

{{div col|colwidth=30em}}
  • Disrupted planet
  • EPIC 204376071 – unusual dimmings (up to 80%)
  • KH 15D – binary star with unusual variations in brightness
  • KIC 8462852 – Tabby's star
  • KOI 126
  • 1SWASP J140747.93-394542.6 − star with unusual ring system eclipses
  • PDS 110 − star surrounded with a disk of dust
  • Przybylski's Star − star with unusual short-lived elements (i.e., technetium and promethium)
  • PSR B1919+21 − pulsar mistaken as alien radio signal (LGM-1)
  • RZ Piscium − star with unusual light fluctuations
  • WD 1145+017 − star ripping apart a planetesimal, producing a dusty disk
{{div col end}}

References

1. ^1 2 {{cite journal |title=VizieR Online Data Catalog: The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2) |journal=CDS/ADC Collection of Electronic Catalogues |first1=N. |last1=Zacharias |first2=S. E. |last2=Urban |first3=M. I. |last3=Zacharias |display-authors=etal |number=1289 |date=2003 |bibcode=2003yCat.1289....0Z}}
2. ^1 2 {{cite journal |title=Proper motions of cool and ultracool candidate members in the Upper Scorpius OB association |journal=Astronomy and Astrophysics |first1=H. |last1=Bouy |first2=E. L. |last2=Martín |volume=504 |issue=3 |pages=981–990 |date=September 2009 |doi=10.1051/0004-6361/200811088 |bibcode=2009A&A...504..981B |arxiv=0907.0149}}
3. ^1 2 {{cite journal |title=Exploring the Full Stellar Population of the Upper Scorpius OB Association |journal=The Astronomical Journal |last1=Preibisch |first1=Thomas |last2=Brown |first2=Anthony G. A. |last3=Bridges |first3=Terry |last4=Guenther |first4=Eike |last5=Zinnecker |first5=Hans |volume=124 |issue=1 |pages=404–416 |date=July 2002 |doi=10.1086/341174 |bibcode=2002AJ....124..404P}}
4. ^1 2 3 4 {{cite journal |title=The peculiar dipping events in the disk-bearing young-stellar object EPIC 204278916 |journal=Monthly Notices of the Royal Astronomical Society, Advanced Access |volume=463 |issue=2 |first1=S. |last1=Scaringi |first2=C. F. |last2=Manara |first3=S. A. |last3=Barenfeld |first4=P. J. |last4=Groot |first5=A. |last5=Isella |first6=M. A. |last6=Kenworthy |first7=C. |last7=Knigge |first8=T. J. |last8=Maccarone |first9=L. |last9=Ricci |first10=M. |last10=Ansdell |display-authors=5 |at=stw2155 |date=August 2016 |doi=10.1093/mnras/stw2155 |bibcode=2016MNRAS.463.2265S |arxiv=1608.07291}}
5. ^{{cite journal |title=VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) |journal=CDS/ADC Collection of Electronic Catalogues |first1=R. M. |last1=Cutri |first2=M. F. |last2=Skrutskie |first3=S. |last3=van Dyk |display-authors=etal |number=2246 |date=June 2003 |bibcode=2003yCat.2246....0C}}
{{Extraterrestrial life}}{{Stars of Scorpius|state=collapsed}}{{Portal bar|Astronomy|Space}}

6 : Astronomical objects discovered in 2016|Scorpius (constellation)|M-type main-sequence stars|Pre-main-sequence stars|2MASS objects|Upper Scorpius
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