by Ann » Thu Jan 01, 2015 12:07 pm
This is a very interesting part of the sky, full of bright stars of spectral classes O, B, A and F. At six o'clock in today's APOD is HD 72127, a multiple star dominated by a B-type component. The combined optical light of the components of HD 72127 is probably about 5,000 times the luminosity of the Sun, and the bolometric (total) luminosity of this multiple star may well be about 50,000 solar luminosities or more. Other luminaries around the Vela supernova remnant, but outside the field of today's APOD, are for example the brilliant O-type and Wolf-Rayet binary Gamma Velorum, O-type supergiant Zeta Puppis, the bright red giant Gamma Velorum, B-type supergiant LN Velorum, A-type bright giants HD 75063 and HD 73634 and F-type supergiant HD 74180. All these stars are likely at least 2,000 times brighter than the Sun in optical light and brighter still bolometrically.
The wealth of brilliant young stars near the Vela supernova remnant is in stark contrast to the modest stars near
the Veil Nebula in Cygnus.
This is pure speculation on my part, but I can't help guessing that the supernova that left the Vela supernova remnant behind was a massive star undergoing core collapse, while the Veil Nebula supernova was more likely type Ia, a white dwarf acquiring mass from a companion until it blew.
Ann
This is a very interesting part of the sky, full of bright stars of spectral classes O, B, A and F. At six o'clock in today's APOD is HD 72127, a multiple star dominated by a B-type component. The combined optical light of the components of HD 72127 is probably about 5,000 times the luminosity of the Sun, and the bolometric (total) luminosity of this multiple star may well be about 50,000 solar luminosities or more. Other luminaries around the Vela supernova remnant, but outside the field of today's APOD, are for example the brilliant O-type and Wolf-Rayet binary Gamma Velorum, O-type supergiant Zeta Puppis, the bright red giant Gamma Velorum, B-type supergiant LN Velorum, A-type bright giants HD 75063 and HD 73634 and F-type supergiant HD 74180. All these stars are likely at least 2,000 times brighter than the Sun in optical light and brighter still bolometrically.
The wealth of brilliant young stars near the Vela supernova remnant is in stark contrast to the modest stars near [url=https://www.photographytips.com/images/0-01091501.jpg]the Veil Nebula[/url] in Cygnus.
This is pure speculation on my part, but I can't help guessing that the supernova that left the Vela supernova remnant behind was a massive star undergoing core collapse, while the Veil Nebula supernova was more likely type Ia, a white dwarf acquiring mass from a companion until it blew.
Ann