O Vz stars are defined as those O-type stars displaying HeII 4686 absorption line stronger than other He line in the blue spectral region. These stars have been...
O Vz stars are defined as those O-type stars displaying He II 4686 absorption line stronger than other He line in the blue spectral region. These stars have...
On the nature of small planets orbiting low-mass stars
Planets smaller than Neptune are ubiquitous in the Galaxy and those around M stars constitute the bulk of warm and temperate worlds amenable for detailed...
On the nature of starburst galaxies at low-z and their connection with interactions
We investigate the properties of starbursts and the influence of galaxy-galaxy interactions on star formation (SF) in a sample of 1341 objects (distances < 40...
Although the occasional malfunction of rotating polarizing elements at the beginning of the SOHO mission, which led to its stop, GOLF instrument has been...
On the nature of VX Sagitarii: Is it the first galactic super-AGB star found?
Stars with initial masses above ~10 M ⊙ have an internal evolution completely different from those in the range between 4 and ~10 M ⊙. The former are able to...
On the occurrence of tidal tails in the Carina dSph
Wide field B,V photometry of the outer regions of the Carina dwarf spheroidal galaxy is presented. Six fields were observed to a distance from the centre up to...
On the optimal station keeping control of halo orbits
Halo orbits of the earth (Farquhar, 1970) and their stationkeeping control are investigated analytically in the framework of the restricted three-body problem...