Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 2957: MX1803-24; WRA 977 AND SAO 251595; NEW OPTICAL CANDIDATE FOR Cir X-1; V616 Mon (A0620-00)

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 2956 SEARCH Read IAUC 2958
IAUC number 

                                                  Circular No. 2957
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


MX1803-24
     G. Jernigan, Massachusetts Institute of Technology, reports
that a new transient x-ray source was observed by SAS 3 during May
13-19 at R.A. = 18h03m47s, Decl. = -24o36'.3 (equinox 1950.0; error radius
1'.5).  The maximum intensity was equal to that of the Crab.


WRA 977 AND SAO 251595
     H. Bradt, Massachusetts Institute of Technology, reports that
the SAS-3 Group has confirmed the suggested identifications 3U
1223-62 = WRA 977 (Vidal 1973, Astrophys. J. 186, L81; WRA 976 can
now be excluded) and 3U 1145-61 = HD 102567 = SAO 251595 (Maraschi
et al. 1976, Nature 259, 292).  Newly determined x-ray positions
with 1'.0 error radii are centered ~ 30" from these Be stars.


NEW OPTICAL CANDIDATE FOR CIRCINUS X-1
     S. K. Mayo, Institute of Astronomy; J. A. J. Whelan,
Anglo-Australian Observatory; and D. T. Wickramasinghe, Australian
National University, report the discovery of a possible optical
counterpart of Cir X-1 (cf. IAUC 2939) that has strong H-alpha emission,
possible weak He 5876 and 6678 A emission and a highly reddened
continuum.  They estimate R ~ 16-17 and B-R ~ 6.  In addition, T. Hawarden
and A. J. Longmore, U.K. Schmidt Unit, report B = 22.5 +/- 0.8 and
confirm the B-R color.  At R.A. = 15h16m48s +/- 0s.3, Decl. = -56o59'14"
+/- 3" (equinox 1950.0), the new candidate is 11s.6 west and 66" south of
the carbon-star candidate (IAUC 2675) and 0s.9 east and 5" north of
the only star visible in the error boxes of Penston et al. (1975,
Monthly Notices Roy. Astron. Soc. 172, 313, plate I)


V616 MONOCEROTIS (A0620-00)
     C. Chevalier, Observatoire de Meudon; S. A. Ilovaisky, Centre
d'Etudes Nucleaires de Saclay; and H. Mauder, Astronomical Institute,
Tubingen University, write: "Photoelectric photometry at the
European Southern Observatory reveals a one-week, approximately
sinusoidal 15-20 percent modulation in the optical flux.  Minima
occurred on Mar. 2, 9 and 18.  Assuming phase agreement with the
x-ray modulation (IAUC 2949), we derive a period of 8.0 +/- 0.2 days,
consistent with that from the x-ray data alone but twice that
suggested by Duerbeck and Walter (1976, Astron. Astrophys. 48, 141)."


1976 June 1                    (2957)              Brian G. Marsden

Read IAUC 2956 SEARCH Read IAUC 2958

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!