FY Canis Majoris

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FY Canis Majoris
Location of FY Canis Majoris (circled)
Observation data
J2000.0
Constellation
Canis Major
Right ascension 07h 26m 59.48269s[1]
Declination −23° 05′ 09.6897″[1]
Apparent magnitude (V) 4.8 - 6.25[2]
Characteristics
Spectral type B0.5 IVe[3]
Variable type γ Cas[2]
Distance
1,820 ± 70 ly
(560 ± 20 pc)
Absolute magnitude (MV)−2.23[4]
Semi-amplitude
(K1)
(primary)		14.4±0.9 km/s
Semi-amplitude (K2)
(secondary)		128.2±2.2 km/s
Details
Be star
Rotational velocity (v sin i)
41±5[5] km/s
HIP 36168, HR 2855, SAO 173752, BD−22 1874[7]
Database references
SIMBADdata

FY Canis Majoris (FY CMa), also known as HD 58978, is a star about 1,800

Puppis). It is usually a 5th magnitude star, so it will be visible to the naked eye of an observer far from city lights. It is a Gamma Cassiopeiae variable
star, whose brightness varies from magnitude 4.8 to 6.25.

Light curves for FY CMa. The upper panel, showing the long-timescale variability, is plotted from ASAS data,[8] and the lower panels, showing short-timescale variability, is plotted from TESS data.[9]

In 1967, Alejandro Feinstein detected low amplitude (0.14 magnitude) variability in HD 58978's brightness, from photoelectric observations at

variable star designation FY Canis Majoris in 1973.[11] During an outburst in 2009, the star brightened to magnitude 4.8, its historical peak brightness.[2] TESS data show that FY CMa pulsates at many different frequencies, with periods ranging from 1.07 hours to 5.8 days.[12]

In 1905,

Hβ (and other) emission lines.[13] Paul Merrill et al. listed it as a Be star in 1925.[14] Spectra taken by various observers over several decades of the 20th century showed that the strength and relative intensities of the star's emission line are variable,[3] and could change on a timescale of just a few days.[15]

In 2008, Geraldine Peters et al. obtained high resolution spectra from the

spectroscopic binary.[5]

Hui-Lau Cao calculated that FY CMa is losing mass at a rate of about 6 × 10−8 M☉/year via a stellar wind with a terminal velocity of about 750 km/sec.[16]

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^ a b c "FY CMa". The International Variable Star Index. AAVSO. Retrieved 1 February 2023.
  3. ^
    doi:10.1086/190820
    .
  4. S2CID 119257644
    .
  5. ^
    doi:10.1086/591145
    .
  6. ^
    doi:10.1093/mnras/stac2245
    .
  7. ^ "HD 58978 -- Be Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-02-01.
  8. ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 1 February 2023.
  9. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 1 February 2023.
  10. Bibcode:1968ZA.....68...29F
    .
  11. Bibcode:1973IBVS..834....1K
    . Retrieved 2 February 2023.
  12. doi:10.1093/mnras/staa389
    .
  13. doi:10.1086/141242
    .
  14. doi:10.1086/142899
    .
  15. Bibcode:1987IAUC.4391....2P
    . Retrieved 1 February 2023.
  16. doi:10.1088/1009-9271/1/6/514
    .
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