Observation by Robin Leadbeater: V381 Lac exceptionally bright

Uploaded by

Robin Leadbeater

Observer

Robin Leadbeater

Observed

2022 Oct 18 - 18:06

Uploaded

2022 Oct 20 - 16:54

Objects

Variable star
Spectrum

Equipment

ALPY 600 Spectrograph
ATIK 428 camera
Celestron C11 SCT at f5.5

Exposure

90min (9x 600s)

Location

Wigton Cumbria UK

Target name

V381 Lac

Title

V381 Lac exceptionally bright

About this image

A spectrum of V381 Lac when exceptionally bright

V381 Lac is a variable star showing R CrB type deep fades due to episodes of dust production. It is classified spectroscopically as an N type Carbon star which show strong molecular bands from Carbon containing compounds.

In early October it was reported in vsnet-alert 26960 to be exceptionally bright at around V mag 11.8. This spectrum taken 2022-10-18 shows a typical high state spectrum with no evidence of the strong NaD and [NII] emission lines seen during fades. The spectrum is compared with standard C-N spectra and with spectra from a previous study, The variable V381 Lac and its possible connection with the R CrB phenomenon, C. Rossi et al MNRAS 456, 2550–2557 (2016)

The lack of emission matches a spectrum taken there in the high brightness state on October 2012, though the continuum and spectral features at the shorter wavelengths better match a spectrum taken during a fade in September 2014

The spectrum is available for download in digital format from the BAA spectroscopy database

Files associated with this observation

V381Lac_20221018_poster.png (363.9 kB)

Like this image

Hugh Allen, Mike Harlow, Dr Paul Leyland

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