The Variable Shell Star HR 5999

A low optical depth region in the inner disk of the Herbig Ae star HR 5999⋆⋆⋆

1 INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy 2 Max Planck Institut für Astronomie, Konigstühl 17, 69117 Heidelberg, Germany e-mail: [email protected] 3 Laboratoire d’Astrophysique de Grenoble, CNRS-UJF UMR 5571, 414 rue de la Piscine, 38400 St Martin d’Hères, France 4 European Southern Observatory, Casilla 19001, Santiago 19, Chile 5 Universidade do Porto, ...

The sixth frequen y of roAp star HR 1217 Margarida

A spectroscopic study of the magnetic CP - star HR 1094 ?

The chemically peculiar star HR 1094 has been investigated with respect to its chemical composition and the magnetic influence on its stellar spectrum. By using spectral lines slightly affected by the field v sin i was determined to be ≤ 17 km s −1. The iron-group elements as well as chlorine and the heavy elements platinum, gold and mercury show an overabundance compared to the sun. The analys...

Luminous Red Variable Star

We report photometry and spectroscopy of the evolution of Nova Sagittarii 1994 #1 (V4332 Sagittarii) during outburst. We compare the photometric and spectral evolution of this outburst to known classes of outbursts – including classical novae and outbursts occurring on symbiotic stars – and find this object does not conform to any known class of outburst. The closest match to the behavior of th...

A double dust shell surrounding the carbon star UAntliae

We have investigated the N-type carbon star U Ant in high resolution IRAS images. We find that the star shows two extended dust shell components and that these two shells are also clearly present in the original survey scan data. We have fitted a double dust shell model with spherical symmetry to the data to obtain the physical quantities of the shells. The inner dust shell component is related...