HD 27563

HD 27563
Location of HD 27563 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 04h 20m 42.8341s[1]
Declination −07° 35′ 32.986″[1]
Apparent magnitude (V) 5.84[2]
Characteristics
Spectral type B5III[3] or B7II[4]
Apparent magnitude (U) 5.23
Apparent magnitude (B) 5.710
Apparent magnitude (G) 5.829944
Apparent magnitude (J) 6.026
Apparent magnitude (H) 6.109
Apparent magnitude (K) 6.113
Variable type SPB[2]
Astrometry
Radial velocity (Rv)11.20±4.3 km/s
Proper motion (μ) RA: 3.540 mas/yr[1]
Dec.: −2.298 mas/yr[1]
Parallax (π)3.7763 ± 0.0612 mas[1]
Distance860 ± 10 ly
(265 ± 4 pc)
Absolute magnitude (MV)−1.05[5]
Details
Mass4.3[6] M☉
Radius2.8[7] R☉
Luminosity687[6] L☉
Surface gravity (log g)3.69[6] cgs
Temperature13,315[6] K
Rotational velocity (v sin i)34[8] km/s
Age180[9] Myr
Other designations
d Eri, 210 G. Eri, EM Eri, HR 1363, HD 27563, HIP 20271, BD−07 798, TIC 37777866, 2MASS J04204283−0735329[10]
Database references
SIMBADdata

HD 27563, also known by the Bayer designation d Eridani, is a single star in Eridanus, in the direction of the Orion–Eridanus Superbubble,[11] that is faintly visible to the naked eye at a magnitude of about 5.84. Cowley (1972) classifies this star as spectral type B5III,[3] but Houk and Swift (1999) catalog it as B7II.[4]

It was used as a comparison star for 46 Eridani in four separate runs at La Silla Observatory in the 1970s and 1980s,[12] but in 1989, both stars were found to be variable with similar periods of about four days, and HD 27563 assigned the designation EM Eridani.[13] Despite the lack of reliable comparisons for EM Eridani, it was found that the power spectrum of its light curve is remarkably noisy, with two or four prominent oscillation periods centered around 3.9215 d,[13][14] and is classified as a slowly pulsating B-type star.[15]

  1. ^ a b c d Cite error: The named reference Gaia EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1972 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference xhip was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference fouesneau2022 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference tic was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference bowman2020 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference gontcharov2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Welsh2005 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Mathys1986 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference IBVS was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Manfroid1989 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference dziembowski1993 was invoked but never defined (see the help page).