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Observations of CI Cam needed to support spectroscopy

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發表於 2016-10-20 21:01:54 | 顯示全部樓層 |閱讀模式
AAVSO Alert Notice 559

October 19, 2016

Observations of CI Cam needed to support spectroscopy

Kelly Gourdji and Marcella Wijngaarden (graduate students at the
University of Amsterdam/Anton Pannekoek Institute for Astronomy)
have requested AAVSO observers' assistance in providing optical
photometry of CI Cam in support of their high-resolution
spectroscopy with the Mercator telescope + Hermes spectrograph in
La Palma from now through January 2017.

They write: "...We are currently observing the variable star
CI Cam (the B[e] optical counterpart of a HMXB system) with the
HERMES spectrograph at the Mercator Telescope in La Palma. Having
observed the star for three nights now, the object appears to be
in outburst. In particular, H alpha was measured to be 80 times
the continuum flux, and increasing between Oct. 9 and 12. This is
similar to the previous outburst in 2004/5. Photometric data
obtained during the 2004/5 outburst suggested an outburst duration
of about 3 months and a peak brightness of 11.2 in the V band."
More information is available in ATel #9634 (Wijngaarden et al.;
www.astronomerstelegram.org/?read=9634).

Multiple snapshot observations per night in BVRI are requested
beginning immediately and continuing through January 2017. Time
series are not necessary unless requested later via an AAVSO
Special Notice. Observations made using other filters will be
useful as well as long as there are multiple observations in these
bands. Unfiltered observations are also useful but preferably only
when they are available for multiple nights (in order to
cross-match with other observations). CI Cam has a V range of
9.5-11.9.

Coordinates (2000.0): R.A. 04 19 42.14   Dec. +55 59 57.7

Charts with a comparison star sequence for CI Cam may be created
using the AAVSO Variable Star Plotter (VSP, https://www.aavso.org/vsp).

Please submit observations to the AAVSO International Database
using the name CI CAM.

This campaign is being followed on the AAVSO Observing Campaigns
webpage (https://www.aavso.org/observing-campaigns). A thread has
been created on the Campaigns and Observation Reports forum at
(https://www.aavso.org/content/ci-cam-observing-campaign).


This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.

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SUBMIT OBSERVATIONS TO THE AAVSO

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ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

An Alert Notice archive is available at the following URL:
https://www.aavso.org/alert-notice-archive

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https://www.aavso.org/observation-notification#alertnotices

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