Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.4404l&link_type=abstract
American Astronomical Society Meeting 202, #44.04; Bulletin of the American Astronomical Society, Vol. 35, p.763
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained a FUSE spectrum of the long-period variable star S Car -- a high-velocity Mira-type variable. This observation gives us the opportunity to probe the temperature- density structure the outer shocked region of the atmosphere of this star using the hydrogen Lyman lines. We obtained an LWRS spectrum in late-May 2001 when this star was at optical light-curve phase 0.35. A very weak emission feature is (possibly) seen just above the noise in this spectrum at the location of the Lyman-beta line. We make flux comparisons between this possible detection of the Lyman-beta line, UV emission lines, and hydrogen Balmer lines obtained at coincident phases in earlier cycles with the IUE and ground-based optical telescopes. This is done to study the effect that the radiation field from the inner, hotter shocks (where Mg II and the Balmer lines form) have on the outer shocked region (where the Lyman lines form). We also make comparisons to synthetic spectra from dynamic models representative of this star. These NLTE radiative transfer calculations have shown that the radiation field of the inner shocks dominate the ionization throughout the entire atmosphere. The calculations also have shown that the Lyman emission lines form in the outer reaches of the atmosphere where the shocks are much weaker as they propagate outward.
This work was partially supported by NASA/FUSE grant NAG5-10344 and was based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer. FUSE is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985.
Castelaz Michael W.
Luttermoser Donald G.
No associations
LandOfFree
Mira Variable Stars in the Far-UV: Results from FUSE does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mira Variable Stars in the Far-UV: Results from FUSE, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mira Variable Stars in the Far-UV: Results from FUSE will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1369140