[vsnet-chat 2579] PUPPIS: new red variable of P Camilleri

[Taichi Kato <tkato>]

PUPPIS: new red variable of P Camilleri

Date: Wed, 19 Jan 2000 16:47:28 +0000
From: JG <jgts@jgws.totalserve.co.uk>
Subject: [vsnet-chat 0] PUPPIS: new red variable of P Camilleri

On the new Red Variable in Puppis discovered by Paul Camilleri, Cobram,
Victoria, Australia, and announced in AAVSO alert 269

CGCS 1825 = CCCS 849 = IRAS_PSC 07373-4021

the following may be of interest to Southern Hemisphere observers:-

This star is also IRAS_PC (IRAS Point Source Catalogue) 07373-4021
(where the co-ordinates in this catalogue are to 1950)

The identification is confirmed in

EPCHTEIN, N., LE BERTRE, T., LEPINE, J. R. D. <ASTR. AP., 227, 82>

in table 2 of which CCCS 849 is cross identified with object number 51 =

IRAS_PSC 07373-4021, where IRAS_PSC is the IRAS Point Source Catalogue
Version 2.0 [and the coordinates are epoch B1950].

J, H, K, L and M photometry are given in the above paper for CGCS 1825 =

CCCS 849, and also in a later paper including some of the same authors:

FOUQUE, P., LE BERTRE, T., EPCHTEIN, N., GUGLIELMO, F., KERSCHBAUM, F.
<ASTR. AP. SUPPL., 93, 151>

where IRAS photometry is also quoted.

The latter paper also carries classification data for this star in its
table 2, which suggests that it is a cool Carbon star surrounded by a
Carbon rich Circumstellar Dust Envelope characterised by SiC [Silicon
Carbide] emission at 11.3 microns, but ironically lies in a region of
the IRAS two colour diagram predominantly occupied by variable oxygen
stars with young oxygen rich circumstellar shells (though this region
does lie adjacent to one characterised by Carbon stars).

The JHKLM photometry, IRAS colours and classifications for this star (as

recorded in the above noted tables) show that this star has strong
similarities, exactly so with respect to classification, with R Volantis

(from the same tables), a Carbon star noted among others in:

WHITELOCK, P. A., FEAST, M. W., MARANG, F., OVERBEEK, M.D, MNRAS, 288,
512 (1997)

as having similarities in their long term lightcurves to the R Coronae
Borealis stars.

REFS

The above papers are readily available via the NASA ADS Articles &
Abstracts Service at adsabs.harvard.edu, in both Acrobat PDF and
Postscript formats

I've forwarded a TDF file to Project Pluto at www.projectpluto.com which
enables the CGCS to be plotted on-screen in Guide 7 planetarium software
[look under extra features], details of accessing the catalogue via the
CDS and ADC are also stated there; I believe the Guide 7 system already
contains a TDF capability for IRAS_PSC, inclusive of error ellipse
plotting.

References and data for some the above were first noted from the
electronic version of the Catalog of Infrared Observations (CIO) 3rd
edition, NASA Reference Publication 1294 (Gezari et al, 1993)
The ADC (adc.gsfc.nasa.gov) now carries this particular catalogue at
edition 5

Cheers and clear skies

John

John Greaves
UNITED KINGDOM

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