Study of the properties and spectral energy distributions of the Herbig AeBe stars HD 34282 and HD 141569

We present a study of the stellar parameters, distances and spectral energy distributions (SEDs) of HD 34282 and HD 141569, two pre-main sequence Herbig AeBe stars. Both objects have been reported to show "anomalous positions" in the HR diagram in the sense that they appear below the main...

Descripción completa

Detalles Bibliográficos
Autores: Merin, B, Montesinos, B, Eiroa, C, Solano, E, Mora, A, D'Alessio, P, Calvet, N, Oudmaijer, RD, de Winter, D, Davies, JK, Harris, AW, Cameron, A, Deeg, HJ, Ferlet, R, Garzon, F, Grady, CA, Horne, K, Miranda, LF, Palacios, J, Penny, A, Quirrenbach, A, Rauer, H, Schneider, J, Wesselius, PR
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2004
País:México
Institución:Universidad Nacional Autónoma de México
Repositorio:Sistema de Información de la Facultad de Ciencias, UNAM
OAI Identifier:oai:repositorio.fciencias.unam.mx:11154/1577
Acceso en línea:http://hdl.handle.net/11154/1577
Access Level:acceso abierto
Palabra clave:Astronomy & Astrophysics
stars : pre-main sequence
stars : fundamental parameters
stars : planetary systems : protoplanetary disks
Descripción
Sumario:We present a study of the stellar parameters, distances and spectral energy distributions (SEDs) of HD 34282 and HD 141569, two pre-main sequence Herbig AeBe stars. Both objects have been reported to show "anomalous positions" in the HR diagram in the sense that they appear below the main sequence. A significant result of this work is that both stars arc metal-deficient. The Hipparcos distance of HD 34282 is very uncertain and the current study places the star at the expected evolutionary position in the HR diagram, i.e. as a PMS star. The distance for HD 141569 found in this work matches the Hipparcos distance, and the problem of its anomalous position is solved as a result of the low metallicity of the object: using the right metallicity tracks, the star is in the PMS region. The SEDs are constructed using data covering ultraviolet to millimetre wavelengths. Physical, non-parametric models, have been applied in order to extract some properties of the disks surrounding the stars. The disk around HD 34282 is accreting actively, it is massive and presents large grains in the mid-plane and small grains in the surface. HD 141569 has a very low mass disk, which is in an intermediate stage towards a debris-type disk.

Similares en LA Referencia