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Astron. Astrophys. 351, L33-L36 (1999)

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Letter to the Editor

Discovery of a faint 437 s X-ray pulsar 1SAX J1452.8-5949

T. Oosterbroek 1, M. Orlandini 2, A.N. Parmar 1, L. Angelini  *  3, G.L. Israel 4, D. DalFiume 2, S. Mereghetti 5, A. Santangelo 6 and G. Cusumano 6

1 Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2 Istituto TESRE, CNR, via Gobetti 101, 40129 Bologna, Italy
3 Laboratory for High Energy Astrophysics, Code 660.2, NASA/Goddard Space Flight Center, MD 20771, USA
4 Osservatorio Astronomico di Roma, Via Frascati 33, Monteporzio Catone, 00040 Roma, Italy
5 Istituto di Fisica Cosmica G. Occhialini, CNR, via Bassini 15, 20133 Milano, Italy
6 IFCAI, CNR, Via U. La Malfa 153, 90146 Palermo, Italy

Received 31 August 1999 / Accepted 21 October 1999


A new pulsar, 1SAX J1452.8-5949, was discovered during a BeppoSAX galactic plane survey on 1999 July 20 at R.A.=[FORMULA], Dec=[FORMULA] (J2000) with a 90% confidence uncertainty radius of [FORMULA]. Coherent pulsations were detected with a barycentric period of a [FORMULA] s. The X-ray spectrum can be modeled by a power-law with a photon index of [FORMULA] and absorption consistent with the galactic value in the direction of the source ([FORMULA] atom cm-2). An Fe K line with a equivalent width of [FORMULA]1.3 keV may be present in the spectrum. The unabsorbed 2-10 keV flux is [FORMULA] erg cm-2 s-1. The X-ray properties and lack of an obvious optical counterpart are consistent with a Be star companion at a distance of between approximately 6 and 12 kpc which implies a luminosity of (4-15)[FORMULA] erg s-1.

Key words: X-rays: stars – stars: individual: 1SAX J1452.8-5949 – stars: neutron – stars: binaries: close – accretion, accretion disks

* Universities Space Research Association

Send offprint requests to: T. Oosterbroek

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© European Southern Observatory (ESO) 1999

Online publication: November 16, 1999