Date: Mon, 4 Feb 2002 08:54:12 -0500 (EST) From: "John R. Thorstensen" <thorsten@partita.dartmouth.edu> To: <tkato@kusastro.kyoto-u.ac.jp> cc: "John R. Thorstensen" <john.thorstensen@dartmouth.edu>, <extpasc@rz.uni-sb.de>, <downes@ststci.edu> Subject: QZ Ser ID ... John Thorstensen (Dartmouth College) reports: The identification of QZ Ser formerly marked in the Downes live CV atlas was incorrect. The correct ID is just northwest of the star near the center of the circle in the atlas, and is near 15 56 54.46, +21 07 18.9 (J2000, from the coordinate system in the DSS-II red image). A spectrum taken of this star with the 2.4m Hiltner telescope at MDM observatory on 2002 January 20 showed the broad H-alpha emission characteristic of a dwarf nova at minimum light, together with a strong contribution from a late-type secondary star. The orbital period is therefore expected to be long, and superhumps are not expected. However, we have just found an example of a very short-period CV with a clearly visible K-type companion (see Thorstensen et al., astrop-ph 0201487), so a search for superhumps is still warranted. Because the identification was in doubt, it would also be worthwhile to derive accurate coordinates for the star in outburst. -- ------------------------------------------------------------- John R. Thorstensen Professor of Physics Department of Physics and Astronomy and Astronomy 6127 Wilder Laboratory Dartmouth College voice: 603-646-2869 Hanover NH 03755-3528 USA FAX: 1446 -------------------------------------------------------------