NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T15:03:58 PDT
Help | Comment | NED Home

For refcode 2000IAUC.7417B...1W:
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Reproduced by permission
2000IAUC.7417B...1W Circular No. 7417 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION VARIABLE STAR IN NGC 3432 R. M. Wagner, Ohio State University; G. D. Schmidt, P. Smith, and D. Hines, Steward Observatory; and S. G. Starrfield, Arizona State University, report: "We obtained a spectrum (resolution 1.3 nm; range 432-740 nm) of the variable star in the field of NGC 3432 (cf. IAUC 7415) on May 6.2 UT with the Steward Observatory CCD SpectroPolarimeter attached to the Bok 2.3-m telescope at Kitt Peak. The spectrum exhibits relatively strong Balmer emission lines of H-alpha (equivalent width = 34.4 nm, FWHM = 1677 km/s) and H-beta (EW = 12.8 nm, FWHM = 2132 km/s) superposed on a smooth continuum. No other species are detected. The centroid of these emission lines yields a redshift of about 0.002. This is consistent with the catalogued redshift of NGC 3432 (0.0020), indicating that the new variable is located in this galaxy and is not a foreground or background object. The spectral features resemble that of a classical nova observed in its early decline phase with an expansion velocity of about 950 km/s. The V continuum magnitude inferred from our spectrum is 19.1 +/- 0.3. If this variable reached an apparent magnitude at maximum of 17-18, then at the distance of NGC 3432, it would imply an absolute visual magnitude of at least -12, compared with the mean absolute magnitude of Galactic and M31 novae at maximum of about -8. If this were a classical nova, then the peak bolometric magnitude, which implies a luminosity exceeding 10**6 that of the sun, is inconsistent with the low expansion velocity that we measure." 2000 May 9 (7417) Daniel W. E. Green
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home