Xi1 Canis Majoris

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Template:Short description Script error: No such module "For".

ξ1 Canis Majoris
Template:Location mark
Location of ξ1 Canis Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.33 – 4.36[2]
Characteristics
Spectral type B1 III[3]
U−B Template:Engvar −0.98[4]
B−V Template:Engvar −0.24[4]
Variable type β Cep[3]
Astrometry
Radial velocity (Rv)+26.9[5] km/s
Proper motion (μ) RA: −2.91[1] mas/yr
Dec.: +6.22[1] mas/yr
Parallax (π)2.36±0.20 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−3.86[6]
Details
MassTemplate:Val[6] Template:Solar mass
RadiusTemplate:Val[6] Template:Solar radius
LuminosityTemplate:Val[6] Template:Solar luminosity
Surface gravity (log g)Template:Val[6] cgs
TemperatureTemplate:Val[6] K
Metallicity [Fe/H]−0.18[7] dex
Rotational velocity (v sin i)0[6] km/s
AgeTemplate:Val[6] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

Xi1 Canis Majoris, Latinized from ξ1 Canis Majoris, is a Beta Cephei variable star in the constellation Canis Major. It is approximately 1,400 light years from Earth.

ξ1 Canis Majoris is a blue-white B-type star. It has generally been assigned a luminosity class of III (giant) or IV (subgiant), for example B1III[3] or B0.5IV.[6] Comparison of its properties with model evolutionary tracks suggest that it is a main sequence star about three quarters of the way through its main sequence lifetime.[6]

File:Xi1CMaLightCurve.png
A light curve for Xi1 Canis Majoris, plotted from TESS data[8]

The apparent magnitude varies from +4.33 to +4.36 with a period of 5.03 hours.[2] Its pulsations cause its radius to vary by 1.0% to 1.5%. At the same time its effective temperature by about Template:Val above and below its mean temperature.[6]

ξ1 Canis Majoris has the longest known rotation period of any B class star, taking around 30 years to complete one revolution on its axis.[9] This is thought to be due to magnetic braking; ξ1 Canis Majoris has the strongest magnetic field of any β Cephei star and would be expected to spin down completely in around four million years. It also has the strongest and hardest X-ray emission of any β Cephei star.[6]

ξ1 Canis Majoris forms a naked eye pairing with ξ2 Canis Majoris a little less than a degree away. The Washington Double Star Catalog lists two 14th magnitude companions about Template:Val away.[10] In addition, an unseen close companion is suspected due to some faint emission lines in the spectrum that are best explained by a Be star invisible against the brighter primary.[6]

References

Template:Reflist

Template:Stars of Canis Major

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named vsx
  3. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named an330_4_317
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Johnson1966
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named rgcrv
  6. ↑ a b c d e f g h i j k l m Cite error: Invalid <ref> tag; no text was provided for refs named schultz2017
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MAST
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named schultz2018
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named wds
Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=Xi1_Canis_Majoris&oldid=2082959"