V1149 Orionis

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V1149 Orionis
Orion constellation map.svg
Red circle.svg
Location of HD 37824 (circled)
Observation data
Epoch J2000 [1]        Equinox J2000 [1]
Constellation Orion
Right ascension 05h 41m 26.78779s [2]
Declination +03° 46′ 40.9348″ [2]
Apparent magnitude  (V)6.59 [3]
Characteristics
Spectral type K0III [3] or K1III [4] + late-F or G [3]
B−V color index +1.14 [5]
J−H color index +0.721 [6]
J−K color index +0.875 [6]
Variable type RS CVn [7]
Astrometry
Radial velocity (Rv)26.90 ± 0.3 [8]  km/s
Proper motion (μ)RA: 34.517 [2]   mas/yr
Dec.: 4.825 [2]   mas/yr
Parallax (π)6.6357 ± 0.0581  mas [2]
Distance 492 ± 4  ly
(151 ± 1  pc)
Absolute magnitude  (MV)0.68±0.37 [3]
Orbit [3]
PrimaryHD 37824 A
CompanionHD 37824 B
Period (P)53.57465±0.00072 d
Semi-major axis (a)19.518±0.083×106 km (minimum)
Eccentricity (e)0.0 (adopted)
Periastron epoch (T)2448625.022±0.037
Details [3]
HD 37824 A
Mass 1.5–2.5  M☉
Radius 12.6±2.2  R☉
Luminosity 67±23  L☉
Metallicity [Fe/H]0.0  dex
Rotation 54.1 [4]
Rotational velocity (v sin i)14.9±1.0 km/s
Other designations
V1149 Ori, AG+03° 687, BD+03° 1007, Gaia DR3  3224222985512259072, HD  37824, HIP  26795, SAO  113040, PPM  149320, TIC  199890794, TYC  123-713-1, GSC  00123-00713, 2MASS J05412678+0346410 [1]
Database references
SIMBAD HD 37824

HD 37824 is a spectroscopic binary star system in the constellation of Orion. It has the variable-star designation V1149 Orionis (abbreviated to V1149 Ori). With an apparent magnitude of 6.59, it is near the limit for naked eye observation from Earth, faintly visible as an orange-hued dot of light under dark skies. It is located approximately 492 light-years (151 parsecs) distant according to Gaia DR3 parallax measurements, and is moving further away at a heliocentric radial velocity of 26.90 km/s.

Contents

Stellar properties

HD 37824 is a single-lined spectroscopic binary, meaning only the light from the luminous primary can be observed in the system's spectra. [4] The two stars orbit each other in a circular orbit (eccentricity 0.0) with a period of 53.57 days. The star features prominent starspots, which are known to display the flip-flop effect; other stars that show this effect include FK Comae Berenices and HD 181809. [3]

The primary star (HD 37824 A) is a chromospherically active K-type giant star in the core helium burning phase. It has a radius of 12.6  R☉ and evolutionary models predict that its mass is 1.5–2.5  M☉. It is radiating 67±23 times the luminosity of the Sun from its photosphere. The unseen secondary, B, is estimated to have a mass of 1.10 M☉ if the orbital inclination is 90°, or 0.95–1.27 M☉ with an inclination of 60°, which makes it likely to be a late-F-type or G-type main-sequence star. [3]

Observational history

A visual band light curve for V1149 Orionis in February 1981, adapted from Hall et al. V1149OriLightCurve.png
A visual band light curve for V1149 Orionis in February 1981, adapted from Hall et al.

In 1973, astronomers William P. Bidelman and Darrell Jack MacConnell reported the detection of Ca II H & K emission lines in the spectra of HD 37824. As such, Douglas S. Hall et al. suspected it to be a RS Canum Venaticorum variable. As expected, in 1983, the star was shown to vary in brightness by 0.11 magnitudes, with photometric and orbital periods of 52.6 and 53.6 days, respectively. [10] It was given its variable star designation in 1985. [11]

The starspots on the surface of the primary star, which are thought to cause the variability, were analyzed using photometric data taken between late 1978 and early 1990. The results were published in 1991, identifying six starspots, which each made the star dim by about 0.1 to 0.3 magnitudes and lasted for several years. The same study refined the orbital period to 53.58±0.02 days. [9]

Observations in 1992 showed a large excess of Hα emission alongside strong Ca II H & K and Hε emission lines. A follow-up study in 1997 reported a lower but still strong Hα emission, as well as a clear emission line from singly ionized helium revealed by spectral subtraction. [12] Additional observations in 2000 discovered high variability in the profile of the Hα line. [4]

See also

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References

  1. 1 2 3 "HD 37824". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 18 November 2024.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 7 8 Fekel, Francis C.; Henry, Gregory W. (2005). "Chromospherically Active Stars. XXIV. The Giant, Single-lined Binaries HD 37824, HD 181809, and HD 217188". The Astronomical Journal. 129 (3): 1669–1685. Bibcode:2005AJ....129.1669F. doi: 10.1086/427713 . ISSN   0004-6256.
  4. 1 2 3 4 Montes, D.; Fernández-Figueroa, M. J.; De Castro, E.; Cornide, M.; Latorre, A.; Sanz-Forcada, J. (2000). "Multiwavelength optical observations of chromospherically active binary systems: III. High resolution echelle spectra from Ca ii H & K to Ca ii IRT". Astronomy and Astrophysics Supplement Series. 146 (1): 103–140. arXiv: astro-ph/0007041 . Bibcode:2000A&AS..146..103M. doi: 10.1051/aas:2000359 . ISSN   0365-0138.
  5. ↑ Høg, E.; et al. (February 2000). "The Tycho-2 Catalogue of the 2.5 Million Brightest Stars". Astronomy and Astrophysics. 355 (1): L27–L30. Bibcode:2000A&A...355L..27H.
  6. 1 2 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  7. ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  8. ↑ Karataş, Y.; Bilir, S.; Eker, Z.; Demircan, O. (2004). "Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution". Monthly Notices of the Royal Astronomical Society. 349 (3): 1069–1092. arXiv: astro-ph/0404219 . Bibcode:2004MNRAS.349.1069K. doi: 10.1111/j.1365-2966.2004.07588.x .
  9. 1 2 Hall, Douglas S.; Fekel, Francis C.; Henry, Gregory W.; Barksdale, William S. (1991). "The 11 year history of starspots on V1149 ORI = HD 37824". The Astronomical Journal. 102: 1808. Bibcode:1991AJ....102.1808H. doi:10.1086/116004.
  10. ↑ Hall, D. S.; Henry, G. W.; Louth, H.; Renner, T. R. (10 October 1983). "HD 37824: a New Variable Star". Information Bulletin on Variable Stars. 2409 (2409). Konkoly Observatory, Budapest: International Astronomical Union: 1. Bibcode:1983IBVS.2409....1H.
  11. ↑ Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Perova, N. B. (March 1985). "The 67th Name-List of Variable Stars". Information Bulletin on Variable Stars. 2681: 1–32. Bibcode:1985IBVS.2681....1K.
  12. ↑ Montes, D.; Fernández-Figueroa, M. J.; De Castro, E.; Sanz-Forcada, J. (1997). "Multiwavelength optical observations of chromospherically active binary systems: I. Simultaneous H α , Na i D 1 , D 2 , and He i D 3 observations". Astronomy and Astrophysics Supplement Series. 125 (2): 263–287. doi: 10.1051/aas:1997374 . ISSN   0365-0138.
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