Central Bureau for Astronomical Telegrams
IAUC 4987: MWC 560; CATACLYSMIC Var IN Crv; 1989c1
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4988
Circular No. 4987
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
MWC 560
P. Szkody, University of Washington; and M. Mateo, Carnegie
Observatories, communicate: "We report blue (460-500 nm) spectra
obtained Mar. 6 and 7 and near-infrared (800-870 nm) spectra obtained
Mar. 9 at the Kitt Peak National Observatory 2.1-m telescope.
In comparison to data taken on nearby dates (IAUC 4980), our blue
spectra show the broad, deep, H-beta absorption feature shifting
from a blue edge velocity of 5640 km/s (FWHM = 500 km/s) on Mar. 6
UT to 6500 km/s (FWHM = 600 km/s) on Mar. 7. The red spectra show
the TiO 845-nm bandhead consistent with an M4.5 III star, but also
have prominent, narrow Ca II lines (849.8, 854.2, 866.2 nm) with no
apparent blueshifted absorption as evident in the Balmer lines."
Visual magnitude estimates by P. Schmeer, Bischmisheim, W.
Germany (cf. IAUC 4982): Mar. 19.86 UT, 9.2; 23.90, 9.1.
CATACLYSMIC VARIABLE IN CORVUS
S. B. Howell, Planetary Science Institute, reports: "Spectra
(range 550-920 nm) taken on Mar. 23 and 24 show that this star (cf.
IAUC 4983) is very hot at outburst and that H-alpha is in emission
above the continuum even during outburst. The decline of the flux
on the second night is very rapid, being down by about 60 percent
in the continuum at H-alpha."
A measurement by R. H. McNaught from a U.K. Schmidt plate of
the quiescent (V = 19) star yields: R.A. = 12h17m48s.64, Decl. =
-18 10'23".2 (equinox 1950.0). The position from an Uppsala Schmidt
film taken Mar. 24.6 UT is R.A. = 12h17m48s.64, Decl. = -18 10'23".5
(V = 14).
Further visual magnitude estimates: Mar. 5.80 UT, [14.0 (A.
Pearce, Scarborough, W. Australia); 19.30, [14.5: (A. Hale, Las
Cruces, NM); 23.80, 14.0 (Pearce).
COMET AUSTIN (1989c1)
E. P. Ney and R. D. Gehrz, University of Minnesota, report that
an observation on Mar. 23.83 UT with the O'Brien 0.76-m telescope
showed the comet to be of mag -1.0 +/- 0.1 at a wavelength of 8.5 microns.
1990 March 28 (4987) Daniel W. E. Green
Read IAUC 4988
Our Web policy. Index to the CBAT/MPC/ICQ pages.
