Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...540..429k&link_type=abstract
The Astrophysical Journal, Volume 540, Issue 1, pp. 429-435.
Astronomy and Astrophysics
Astronomy
13
Stars: Circumstellar Matter, Stars: Novae, Cataclysmic Variables, Polarization, Stars: Individual (V4444 Sagittarii)
Scientific paper
We present the results of our optical spectropolarimetry of nova V4444 Sagittarii 1999 in its early stage. The observations were performed on four nights from 1999 April 29 (t=2 days) to 1999 May 7 (t=10 days). The polarization properties, including the absence of polarization difference across strong emission lines, have remained unchanged through the period. The observed polarization degree increases monotonically toward shorter wavelength. We separate the interstellar polarization component from the observed polarization by assuming that the component intrinsic to this nova has a power-law-type function of wavelength. The decomposed intrinsic polarization can be explained by scattering due to small grains. These results suggest the preexistence of the dust cloud in the vicinity of the nova, at least several dozens of AU from the central star.
Akitaya Hiroshi
Hirata Ryuko
Ikeda Yuji
Kawabata Koji S.
Matsumura Masafumi
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