Feb 7 – 9, 2017
Radisson Hotel Lansing
US/Eastern timezone

The first simulations of X-ray bursts during a time-variable accretion event

Feb 8, 2017, 11:45 AM
15m
Radisson Hotel Lansing

Radisson Hotel Lansing

111 N Grand Ave, Lansing, MI 48933
Talk [Main Conference] Contributed talk Session 6

Speaker

Mr Zac Johnston (Monash Centre for Astrophysics, Monash University)

Description

Type I X-ray bursts are periodic flares from the surface of accreting neutron stars, triggered when the accreted envelope is compressed to thermonuclear runaway. They can be fuelled by transient accretion outbursts, during which the accretion rate can vary by an order of magnitude in a matter of days. The pulsar SAX J1808.4-3658 exhibits outbursts every 2–3 years, and four helium-rich X-ray bursts were observed during a typical month-long outburst in 2002. We present the first multi-zone simulations of X-ray bursts with time-dependent accretion rates, using the 2002 outburst as a test case. In addition to reproducing the observed burst properties, we find that using an averaged, constant accretion rate systematically overestimates the burst rate.

Primary author

Mr Zac Johnston (Monash Centre for Astrophysics, Monash University)

Co-authors

Prof. Alexander Heger (Monash Centre for Astrophysics, Monash University) Dr Duncan Galloway (Monash Centre for Astrophysics, Monash University)

Presentation materials

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