HD 27563
 Location shown, annotated: d | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 20m 42.8341s |
| Declination | −07° 35′ 32.9857″ |
| Apparent magnitude (V) | 5.838 |
| Astrometry | |
| Radial velocity (Rv) | 11.20±4.3 km/s |
| Proper motion (μ) | RA: 3.540[1] mas/yr Dec.: −2.298[1] mas/yr |
| Parallax (π) | 3.7763 ± 0.0612[1] mas |
| Distance | 860 ± 10 ly (265 ± 4 pc) |
| Characteristics | |
| Spectral type | B5III[2] or B7II[3] |
| 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[4] |
| Other designations | |
HD 27563, also known by the Bayer designation d Eridani, is a single Be star[5] in Eridanus, in the direction of the Orion–Eridanus Superbubble,[6] that is faintly visible to the naked eye at a magnitude of about 5.838.[7] Cowley (1972) classify this star as spectral type B5III,[2] but Houk and Swift (1999) catalog it as B7II.[3]
It was used as a comparison star for 46 Eridani in four separate runs at La Silla Observatory in the 1970s and 1980s,[8] 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.[9] 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,[9][10] and is classified as a slowly pulsating B-type star.[11][4]
References
- ↑ 1.0 1.1 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. Unknown parameter
|s2cid=ignored (help) Gaia EDR3 record for this source at VizieR. - ↑ 2.0 2.1 Cowley, A. (1 November 1972). "Spectral classification of the bright B8 stars". The Astronomical Journal. 77: 750–755. Bibcode:1972AJ.....77..750C. doi:10.1086/111348. ISSN 0004-6256.
- ↑ 3.0 3.1 Houk, N.; Swift, C. (1 January 1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5: 0. Bibcode:1999MSS...C05....0H.
- ↑ 4.0 4.1 "VizieR". vizier.cds.unistra.fr.
- ↑ Abt, H. A.; Cardona, O. (October 1984). "Be stars in binaries". The Astrophysical Journal. 285: 190. Bibcode:1984ApJ...285..190A. doi:10.1086/162490.
- ↑ Welsh, B. Y.; Sallmen, S.; Jelinsky, S. (September 2005). "NaI and CaII absorption components observed towards the Orion-Eridanus Superbubble". Astronomy & Astrophysics. 440 (2): 547–557. Bibcode:2005A&A...440..547W. doi:10.1051/0004-6361:20052691. Unknown parameter
|s2cid=ignored (help) - ↑ "EM Eri". simbad.u-strasbg.fr. Retrieved 20 May 2023.
- ↑ Mathys, G.; Manfroid, J.; Renson, P. (1 March 1986). "Photometric variability of some early-type stars". Astronomy and Astrophysics Supplement Series. 63: 403–416. Bibcode:1986A&AS...63..403M. ISSN 0365-0138.
- ↑ 9.0 9.1 Manfroid, J. (1 March 1989). "On the Light Curve of HD 27563". Information Bulletin on Variable Stars. 3297: 1. Bibcode:1989IBVS.3297....1M. ISSN 0374-0676.
- ↑ Manfroid, J.; Renson, P. (1 October 1989). "Photometric variations of 46 Eridani and 210 G. Eridani". Astronomy and Astrophysics. 223: 187–195. Bibcode:1989A&A...223..187M. ISSN 0004-6361.
- ↑ Dziembowski, W. A.; Moskalik, P.; Pamyatnykh, A. A. (1 December 1993). "The opacity mechanism in B-type stars - II. Excitation of high-order g-modes in main-sequence stars". Monthly Notices of the Royal Astronomical Society. 265 (3): 588–600. Bibcode:1993MNRAS.265..588D. doi:10.1093/mnras/265.3.588. ISSN 0035-8711.
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