The starburst galaxy PG 1136+581=Mkn 1450 misclassified as a cataclysmic variable.

Details The starburst galaxy PG 1136+581=Mkn 1450 misclassified as a cataclysmic variable. The starburst galaxy PG 1136+581=Mkn 1450 misclassified as a cataclysmic variable.

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296..310m&link_type=abstract

Astronomy and Astrophysics, v.296, p.310

Astronomy and Astrophysics

Astrophysics

1

Galaxies: Starburst, Galaxies: Individual: Mkn 1450=Pg 1136+581, Supernovae, Cataclysmic Variables, Stars: Pg 1136+581

Scientific paper

From direct CCD imaging, BVR_C_I_C_ photometry, low- and high-resolution spectrophotometry it is shown that PG 1136+581 is not a cataclysmic variable as reported in the Palomar Green survey, but a small and faint starburst galaxy at z=0.00280 identical to Markarian 1450. The emission line spectrum well conforms to the expectations of Case B under low electron densities. The emission lines are very narrow (~44km/s) and the forbidden ones particularly strong, with [O III]5007A/Hα=2. The reddening amounts to E_B-V_=0.07. The narrowness of the emission lines and absence of photometric variability in excess of 0.1mag over the period 1983-1991 tends to exclude the presence of any AGN-like activity. In spite of some gaps in the photometric patrolling, it is quite possible that no supernova has exploded in PG 1136+581 during the period 1983-1991.

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