Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-10
Astron.Astrophys. 397 (2003) 285-304
Astronomy and Astrophysics
Astrophysics
20 pages, 12 figures, 8 tables, accepted by A&A
Scientific paper
10.1051/0004-6361:20021481
We present simultaneous and continuous observations of the H$\alpha$, H$\beta$, He {\sc i} D$_{3}$, Na {\sc i} D$_{1}$,D$_{2}$ doublet and the Ca {\sc ii} H & K lines for the RS CVn system HR 1099. The spectroscopic observations were obtained during the MUSICOS 1998 campaign involving several observatories and instruments, both echelle and long-slit spectrographs. During this campaign, HR 1099 was observed almost continuously for more than 8 orbits of $2\fd8$. Two large optical flares were observed, both showing an increase in the emission of H$\alpha$, Ca {\sc ii} H & K, H$\beta$ and He {\sc i} D$_{3}$ and a strong filling-in of the Na {\sc i} D$_{1}$,D$_{2}$ doublet. {Contemporary photometric observations were carried out with the robotic telescopes APT-80 of Catania and Phoenix-25 of Fairborn Observatories. Maps of the distribution of the spotted regions on the photosphere of the binary components were derived using the Maximum Entropy and Tikhonov photometric regularization criteria}. Rotational modulation was observed in H$\alpha$ and He {\sc i} D$_{3}$ in anti-correlation with the photometric light curves. Both flares occurred at the same binary phase (0.85), suggesting that these events took place in the same active region. Simultaneous X-ray observations, performed by ASM on board RXTE, show several flare-like events, some of which correlate well with the observed optical flares. Rotational modulation in the X-ray light curve has been detected with minimum flux when the less active G5 V star was in front. A possible periodicity in the X-ray flare-like events was also found.
Doyle Gerry J.
Foing Bernard H.
Garcia-Alvarez David
Montes David
Oliveira Maria Joao
No associations
LandOfFree
Simultaneous Optical and X-ray Observations of Flares and Rotational Modulation on the RS CVn Binary HR 1099 (V711 Tau) from the MUSICOS 1998 Campaign 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 Simultaneous Optical and X-ray Observations of Flares and Rotational Modulation on the RS CVn Binary HR 1099 (V711 Tau) from the MUSICOS 1998 Campaign, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simultaneous Optical and X-ray Observations of Flares and Rotational Modulation on the RS CVn Binary HR 1099 (V711 Tau) from the MUSICOS 1998 Campaign will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-542170