Principal     To Survive in the Universe    
Services
    Why to Inhabit     Top Contributors     Astrofotografía     La Colección     Foro     Blog New!     FAQ     Login  
→ Adopt this star  

HD 142821


Contenidos

Imágenes

Subir su imagen

DSS Images   Other Images


Artículos relacionados

Pulsation in the pre-main-sequence Herbig Ae star HD 142666
Asteroseismology of pre-main-sequence δ Scuti stars has thepotential not only to provide unprecedented constraints on models ofthese stars, but also to allow for the possibility of detectingevolutionary period changes, thus providing a direct measure of thepre-main-sequence evolutionary time-scale. In the last two years, thepublished number of such stars known has doubled from four to eight.Searches are now being conducted amongst the Herbig Ae stars, which areconsidered to be excellent candidates. We announce the discovery ofδ Scuti pulsation in one Herbig Ae star, HD 142666, which lieswithin Marconi & Palla's theoretically predicted instability stripfor pre-main-sequence stars, making this the ninth knownpre-main-sequence δ Scuti star. We also demonstrate a lack ofδ Scuti pulsation in another such star, HD 142527.

A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.

Mitteilungen uber Veranderliche der Bamberger Liste.
Not Available

Enviar un nuevo artículo


Enlaces relacionados

  • - No se han encontrado enlaces -
En viar un nuevo enlace


Miembro de los siguientes grupos:


Datos observacionales y astrométricos

Constelación:Lobo
Ascensión Recta:15h58m19.75s
Declinación:-41°39'34.6"
Magnitud Aparente:7.916
Distancia:266.667 parsecs
Movimiento Propio en Ascensión Recta:-6.9
Movimiento Propio en Declinación:-9.1
B-T magnitude:8.097
V-T magnitude:7.931

Catálogos y designaciones:
Nombres Propios
HD 1989HD 142821
TYCHO-2 2000TYC 7846-212-1
USNO-A2.0USNO-A2 0450-22623428
HIPHIP 78215

→ Solicitar más catálogos y designaciones a VizieR