Browsing University of Galway Support Services by Subject "h-alpha emission"
Now showing items 1-4 of 4
-
Confirmation of the electron cyclotron maser instability as the dominant source of radio emission from very low mass stars and brown dwarfs
(IOP Publishing, 2008-09-01)We report on radio observations of the M8.5 dwarf LSR J1835+3259 and the L3.5 dwarf 2MASS J00361617+ 1821104, which provide the strongest evidence to date that the electron cyclotron maser instability is the dominant ... -
Modelling the radio pulses of an ultracool dwarf
(EDP Sciences, 2010-11-30)Context. Recently, unanticipated magnetic activity in ultracool dwarfs (UCDs, spectral classes later than M7) has emerged from a number of radio observations. The highly (up to 100%) circularly polarized nature and high ... -
Phase connecting multi-epoch radio data for the ultracool dwarf tvlm 513-46546
(EDP Sciences, 2010-11-19)Context. Radio data obtained for the ultracool dwarf TVLM 513-46546 has indicated a rotation period of approximate to 1.96 h via regular radio pulses, but how stable is this period. This has major implications regarding ... -
Rotational modulation of the radio emission from the m9 dwarf tvlm 513−46546: broadband coherent emission at the substellar boundary?
(IOP Publishing, 2006-12-10)The Very Large Array was used to observe the ultracool rapidly rotating M9 dwarf TVLM 513-46546 simultaneously at 4.88 and 8.44 GHz. The radio emission was determined to be persistent, variable, and periodic at both ...