HR 1099
  | ||
| Observation data J2000
| ||
|---|---|---|
| Constellation | Taurus | |
| A | ||
| Right ascension | 03h 36m 47.291s[1] | |
| Declination | 00° 35′ 15.94″[1] | |
| Apparent magnitude (V) | 5.91[2] | |
| B | ||
| Right ascension | 03h 36m 46.844s[3] | |
| Declination | 00° 35′ 15.93″[3] | |
| Apparent magnitude (V) | 8.79[2] | |
| Characteristics | ||
| Spectral type | K2:Vnk[4] (K1 IV + G5 V + K3 V)[5] | |
| Variable type | RS CVn[6] | |
| Absolute magnitude (MV) | 6.5[2] | |
Semi-amplitude (K1)(primary) | 52.6 km/s | |
| Semi-amplitude (K2) (secondary) | 64.1 km/s | |
| Details | ||
| Component Aa | ||
Rotational velocity (v sin i) | 39[9] km/s | |
| Component Ab | ||
| Mass | 0.8[8] M☉ | |
| Radius | 1.1[8] R☉ | |
| Surface gravity (log g) | 4.26[5] cgs | |
| Temperature | 5,500[5] K | |
| Component B | ||
Gyr | ||
| Database references | ||
| SIMBAD | data | |
HR 1099 is a
of about −15 km/s.This system was discovered to be a
hydrogen–α line of component A is fully in emission and it displays moderate broadening due to rotation. He found a stellar classification of K3 V for component B, matching an ordinary K-type main-sequence star.[18]
Observations during 1974–1975 demonstrated that component A is a
HEAO 1 satellite.[23]
This double-lined
In 1980, significant variations were found in some spectral features related to surface temperature, suggesting the presence of starspots.[25] Doppler imaging confirmed these starspots are associated with the K subgiant. (It was the first cool star to have its surface Doppler imaged.[26]) The evidence suggests that the spots first appear at low latitude then migrated toward the poles.[20] These spots are much larger than they are on the Sun.[5] About 70% of all spots have been observed at latitudes higher than 50°, particularly around the polar region.[9][24] A polar spot has persisted for at least twenty years.[5]
The baseline apparent magnitudes of the two stars, after subtracting the effects of starspots, is 5.80 and 7.20.axis of rotation.[26]
See also
References
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 59396964.
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 119476992.
- ^ .
- ^ S2CID 125853869.
- Bibcode:2000A&A...354..537S.
- ^ .
- ^ .
- ^ S2CID 119258214.
- ^ S2CID 166227927.
- S2CID 119511744, 21.
- ^ "HD 22468A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-01-04.
- ^ "HD 22468B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-01-04.
- ISBN 0-933346-84-0.
- doi:10.1086/323920.
- doi:10.1086/147689.
- S2CID 111386087.
- ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 22 January 2023.
- ^ S2CID 123206530.
- ^ hdl:2152/34302.
- Bibcode:1976IAUC.2929....2O.
- S2CID 4206226.
- ^ S2CID 119463091.
- doi:10.1086/183306.
- ^ S2CID 14242208.
Further reading
- Perdelwitz, V.; et al. (August 2018), "Long-term variations in the X-ray activity of HR 1099", Astronomy & Astrophysics, 616: A161, S2CID 55130058, A161.
- Osten, Rachel A.; et al. (July 2004), "A Multiwavelength Perspective of Flares on HR 1099: 4 Years of Coordinated Campaigns", Astrophysical Journal Supplement Series, 153 (1): 317–362, S2CID 119522693.
- Ransom, R. R.; et al. (June 2002), "Possible Corotation of the Milliarcsecond Radio Structure of the Close Binary HR 1099", Astrophysical Journal, 572 (1): 487–502, S2CID 120225374.
- Ayres, Thomas R.; et al. (March 2001), "Chandra, EUVE, HST, and VLA Multiwavelength Campaign on HR 1099: Instrumental Capabilities, Data Reduction, and Initial Results", Astrophysical Journal, 549 (1): 554–577, S2CID 15938906.
- Brinkman, A. C.; et al. (January 2001), "First light measurements with the XMM-Newton reflection grating spectrometers: Evidence for an inverse first ionisation potential effect and anomalous Ne abundance in the Coronae of HR 1099", Astronomy and Astrophysics, 365: L324–L328, S2CID 15848464.
- Audard, M.; et al. (January 2001), "The XMM-Newton view of stellar coronae: Flare heating in the coronae of HR 1099", Astronomy and Astrophysics, 365: L318–L323, .
- Vogt, Steven S.; et al. (April 1997), "Doppler Imagery of the Spotted RS CVn Star HR 1099 (= V711 Tau) from 1981 - 1992", Astrophysical Journal Supplement Series, 121: 547, S2CID 119515171.
- Trigilio, C.; et al. (February 1993), "VLBI observations of a strong radio flare in HR 1099", Monthly Notices of the Royal Astronomical Society, 260 (4): 903–907, .
- Donati, J. -F.; et al. (November 1992), "Photospheric imaging of the RS CVn system HR 1099.", Astronomy and Astrophysics, 265: 682–700, Bibcode:1992A&A...265..682D.
- Donati, J. -F.; et al. (June 1990), "Detection of a magnetic region of HR 1099", Astronomy and Astrophysics, 232: L1–L4, Bibcode:1990A&A...232L...1D.
- Rodono, M.; et al. (April 1987), "Rotational modulation and flares on RS CVn and BY DRA stars. III. IUEobserations of V711 Tau = (HR 1099), II Peg and AR Lac", Astronomy and Astrophysics, 176: 267–284, Bibcode:1987A&A...176..267R.
- Lestrade, J. F.; et al. (July 1984), "Detection of a sub-milliarcsecond radio component in the RS CVn system HR 1099", Astrophysical Journal, 282: L23–L26, doi:10.1086/184296.
- Fekel, F. C. Jr. (May 1983), "Spectroscopy of V711 Tauri (= HR 1099) : fundamental properties and evidence for starspots", Astrophysical Journal, 268: 274–281, doi:10.1086/160952.
- Dorren, J. D.; et al. (April 1981), "Starspots on V711 Tauri (HR 1099)", Astronomical Journal, 86: 572–582, doi:10.1086/112918.
- Brown, R. L.; Crane, P. C. (December 1978), "On the rapidly variable circular polarization of HR 1099 at radio frequencies", Astronomical Journal, 83: 1504–1509, doi:10.1086/112352.
- Feldman, P. A.; et al. (December 1978), "Discovery of a strong radio flaring from HR 1099", Astronomical Journal, 83: 1471–1484, doi:10.1086/112346.
- Bopp, B. W.; Talcott, J. C. (December 1978), "Survey of Halpha emission in V711 Tau (HR 1099) and related Ca II emission binaries", Astronomical Journal, 83: 1517–1521, doi:10.1086/112355.
- Gibson, D. M.; et al. (December 1978), "VLA observations of HR 1099 during the 1977 international campaign", Astronomical Journal, 83: 1495–1498, doi:10.1086/112350.
- Weiler, E. J.; et al. (August 1980), "Coordinated ultraviolet, optical, and radio observations of HR 1099 and UX Arietis", Astrophysical Journal, 239: L121–L124, doi:10.1086/183306.
- Owen, F. N.; et al. (November 1976), "The detection of radio emission from the RS CVn binary HR 1099", Astrophysical Journal, 210: L27–L30, doi:10.1086/182295.
