Difference: Bestars (3 vs. 4)

Revision 42018-10-03 - ChandlerLee

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 Conference Presentations/Proceedings/Papers
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  AAS233 2019
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+Witnessing the Disk Formation and Dissipation Process in the Eruptive Be Star HO Puppis
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+ZTF Observations of the Disk Formation and Dissipation Process in the Eruptive Be Star HO Puppis
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+C.-D. Lee, C.-C. Ngeow, P.-C. Yu and ZTF Collaboration
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+C.-D. Lee, C.-C. Ngeow, P.-C. Yu, J.-Y. Ou and ZTF Collaboration
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+The hot circumstellar gas in the line-emitting region of Be stars were majorly supplied by the eruptive stellar activity like matter outburst, known as decretion disk. In the outburst event, one can see the photometric fading, since the material was popped up and obscured in the line of sight, along with the spectroscopic brightening in Balmer lines. However, a well-covered spectroscopic follow up was rarely observed, because most of the fadings last more than hundreds days. Now, an enormous amount of Be stars was observed and monitored, after Zwicky Transient Facility (ZTF) survey started. Among them, we have found one Be star in active phase showing several deep fadings up to 2.5 mag. It is HO puppis, also known as a Gamma Cassiopeia type variable, displaying eruptive irregular variation.  Even thought the variability type was previously identified in ASAS-SN catalog, the remarkable and repeatable fading events (~30 days) were recorded for the first time. In this work, we present HO puppis light curve with eruptive variability following up by spectroscopic observations using SED machine for witnessing the entire disk decretion process including formation and dissipation.
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+The hot circumstellar gas in the line-emitting region of Be stars were mainly supplied by the eruptive stellar activity like matter outburst, known as decretion disk. During the outburst events, because of the obscuration along the line of sight from popped up materials, such Be stars will display dips or fading on their light curves, together with the spectroscopic brightening in Balmer lines.  However, a well-covered spectroscopic follow up observationswas rarely achieved, because most of the fading events last more than hundreds days. In this work, we report the finding of fading events for HO Pup, a Be star known as Gamma Cassiopeia type variable, based on a few months commissioning data from the Zwicky Transient Facility (ZTF). The g and r band light curves from ZTF clearly displayed the fading events up to 2.5 magnitudes. We supplemented the ZTF data with light curve data from ASAS-SN survey, the combined light curves clearly display eruptive variability in the past 4 years. Together with the proposed spectroscopic observations, we may witnessing the entire disk decretion process including formation and dissipation for HO Pup.
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+-- ChowChoongNgeow - 17 Jul 2018
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+--  ChowChoongNgeow  - 17 Jul 2018

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