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The eclipsing binary V578 Mon in the Rosette nebula: age and distance to NGC 2244 using Fourier disentangled component spectra


Hensberge, Herman; Pavlovski, Krešimir; Verschueren, Werner
The eclipsing binary V578 Mon in the Rosette nebula: age and distance to NGC 2244 using Fourier disentangled component spectra // Astronomy and astrophysics, 358 (2000), 2; 553-571 (međunarodna recenzija, članak, znanstveni)


Naslov
The eclipsing binary V578 Mon in the Rosette nebula: age and distance to NGC 2244 using Fourier disentangled component spectra

Autori
Hensberge, Herman ; Pavlovski, Krešimir ; Verschueren, Werner

Izvornik
Astronomy and astrophysics (0004-6361) 358 (2000), 2; 553-571

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
radial velcities; eclipsing binaries; distances; V578 Mon;fundametal parameters;open clusters and associations; NGC 2244
(radial velocities; eclipsing binaries; distances; V578 Mon; fundametal parameters; open clusters and associations; NGC 2244)

Sažetak
V578 Mon is a member of the young stellar cluster NGC 2244 which is embedded in the Rosette nebula. It is a double-lined binary, consisting of two early-B type components which eclipse each other partially during their 2.40848-day orbit. A novel technique of Fourier disentangling is applied to disentangle the spectrum of the binary into the spectra of its components, allowing a direct spectroscopic temperature determination for each component. Together with an analysis of the light curve, the spectral disentangling process allows us to derive the orbital and fundamental stellar parameters. The hotter star (Teff=30000 K) has a mass of 14.5 Msun and a radius of 5.2 Rsun. The cooler one (Teff=26400 K) has a mass of 10.3 Msun and a radius of 4.3 Rsun. Both stars are well inside their critical Roche lobe and move in an eccentric orbit (e=0.087) which has a semi-major axis of 22Rsun and is seen at an inclination of 72.6 deg. The rotation of both stars is synchronized with the orbital motion. The systemic velocity of 34.9 km/s confirms that the binary belongs to NGC 2244. The age of the binary, and hence of NGC 2244, is (2.3 +/- 0.2)10^6 years. From the fundametnal stellar parameters and the interstellar absorption, the distance to the cluster is derived to be 1.39 +/- 0.1 kpc, i.e. slightly lower than that found from photometric studies. Its age and space velocity indicate that NGC 2244 is formed in the galactic plane. The high accuracy obtained (e.g. probable erros of 0.5% for the masses, 1-1.5% for the radii, despite the lack of total eclipses, and 1.5% for the temperatures) is a direct consequence of the spectral disentangling technique, which as a by-product delivers very accurate radial velocities for all orbital phases.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
007002

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Krešimir Pavlovski (autor)

Citiraj ovu publikaciju

Hensberge, Herman; Pavlovski, Krešimir; Verschueren, Werner
The eclipsing binary V578 Mon in the Rosette nebula: age and distance to NGC 2244 using Fourier disentangled component spectra // Astronomy and astrophysics, 358 (2000), 2; 553-571 (međunarodna recenzija, članak, znanstveni)
Hensberge, H., Pavlovski, K. & Verschueren, W. (2000) The eclipsing binary V578 Mon in the Rosette nebula: age and distance to NGC 2244 using Fourier disentangled component spectra. Astronomy and astrophysics, 358 (2), 553-571.
@article{article, year = {2000}, pages = {553-571}, keywords = {radial velocities, eclipsing binaries, distances, V578 Mon, fundametal parameters, open clusters and associations, NGC 2244}, journal = {Astronomy and astrophysics}, volume = {358}, number = {2}, issn = {0004-6361}, title = {The eclipsing binary V578 Mon in the Rosette nebula: age and distance to NGC 2244 using Fourier disentangled component spectra}, keyword = {radial velocities, eclipsing binaries, distances, V578 Mon, fundametal parameters, open clusters and associations, NGC 2244} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • The INSPEC Science Abstracts series
  • Astronomy and Astrophysics Abstracts