The Hubble Space Telescope observations of X-ray nova MUSCAE 1991 and its spectral evolution

Cheng, Fuhua; Horne, K.; Panagia, N.; Shrader, C. R.; Gilmozzi, R.; Paresce, Francesco; Lund, N.

doi:10.1086/171822

Cited by 38 publications

(48 citation statements)

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“…Next, we correct for reddening, relying on two observations of the 2200Å dust feature in the ultraviolet spectrum of NovaMus. Cheng et al (1992) reported E(B − V ) = 0.287 ± 0.004 based on observations made using the Faint Object Spectrograph (FOS) onboard the Hubble Space Telescope, while Shrader & Gonzalez-Riestra (1993) obtained a consistent result, E(B − V ) = 0.30 ± 0.05 based on observations made using the International Ultraviolet Explorer. We take E(B − V ) = 0.29 ± 0.05, adopting the larger error bar to cover the uncertainty in converting E(B − V ) to A V using the standard extinction law:…”

Section: Distance Of Novamusmentioning

confidence: 98%

The Mass of the Black Hole in the X-Ray Binary Nova Muscae 1991

Chen

Gou

McClintock

et al. 2016

ApJ

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The optical counterpart of the black-hole soft X-ray transient Nova Muscae 1991 has brightened by ∆V ≈ 0.8 mag since its return to quiescence 23 years ago. We present the first clear evidence that the brightening of soft X-ray transients in quiescence occurs at a nearly linear rate. This discovery, and our precise determination of the disk component of emission obtained using our simultaneous photometric and spectroscopic data, have allowed us to identify and accurately model archival ellipsoidal light curves of the highest quality. The simultaneity, and the strong constraint it provides on the component of disk emission, is a key element of our work. Based on our analysis of the light curves, and our earlier measurements of the mass function and mass ratio, we have obtained for Nova Muscae 1991 the first accurate estimates of its systemic inclination i = 43.2 −0.65 kpc. We discuss the implications of our work for future dynamical studies of black-hole soft X-ray transients.

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Section: Distance Of Novamusmentioning

confidence: 98%

The Mass of the Black Hole in the X-Ray Binary Nova Muscae 1991

Chen

Gou

McClintock

et al. 2016

ApJ

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“…Many other classes of outbursting astrophysical objects, such as dwarf novae and soft X-ray transients, show similar flux decay in the end of the bursts. Current interpretation is that the accretion disc instability arising from partial ionization of the hydrogen (socalled thermal-viscosity instability) governs the observed outburst dynamics (Meyer & Meyer-Hofmeister 1984;Smak 1984;Mineshige et al 1993;Cheng et al 1992;Chen et al 1997). Here we discuss whether disc instability can be responsible for the observed behaviour of 4U 0115+63 and V 0332+53.…”

Section: Accretion Disc Instabilitymentioning

confidence: 99%

Propeller effect in two brightest transient X-ray pulsars: 4U 0115+63 and V 0332+53

Tsygankov

Lutovinov

Doroshenko

et al. 2016

A&A

105

111

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Aims. We present the results of the monitoring programmes performed with the Swift/XRT telescope and aimed specifically to detect an abrupt decrease of the observed flux associated with a transition to the propeller regime in two well-known X-ray pulsars 4U 0115+63 and V 0332+53. Methods. Both sources form binary systems with Be optical companions and undergo so-called giant outbursts every 3-4 years. The current observational campaigns were performed with the Swift/XRT telescope in the soft X-ray band (0.5-10 keV) during the declining phases of the outbursts exhibited by both sources in 2015.Results. The transitions to the propeller regime were detected at the threshold luminosities of (1.4 ± 0.4) × 10 36 erg s −1 and (2.0 ± 0.4) × 10 36 erg s −1 for 4U 0115+63 and V 0332+53, respectively. Spectra of the sources are shown to be significantly softer during the low state. In both sources, the accretion at rates close to the aforementioned threshold values briefly resumes during the periastron passage following the transition into the propeller regime. The strength of the dipole component of the magnetic field required to inhibit the accretion agrees well with estimates based on the position of the cyclotron lines in their spectra, thus excluding presence of a strong multipole component of the magnetic field in the vicinity of the neutron star.

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“…reviews by Cherepashchuk 2000;Lasota 2001;Warner 2003), but previously were not considered for X-ray pulsars (XRPs). The transition is associated with the so-called thermal-viscous instability that arises as a result of the partial ionisation of hydrogen in an accretion disc (Meyer & Meyer-Hofmeister 1984;Smak 1984;Mineshige et al 1993;Cheng et al 1992;Chen et al 1997). …”

Section: Introductionmentioning

confidence: 99%

Stable accretion from a cold disc in highly magnetized neutron stars

Tsygankov

Mushtukov

Suleimanov

et al. 2017

A&A

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Aims. The aim of this paper is to investigate the transition of a strongly magnetized neutron star into the accretion regime with very low accretion rate. Methods. For this purpose, we monitored the Be-transient X-ray pulsar GRO J1008−57 throughout a full orbital cycle. The current observational campaign was performed with the Swift/XRT telescope in the soft X-ray band (0.5-10 keV) between two subsequent Type I outbursts in January and September 2016. Results. The expected transition to the propeller regime was not observed. However, transitions between different regimes of accretion were detected. In particular, after an outburst the source entered a stable accretion state characterised by an accretion rate of ∼ 10 14 − 10 15 g s −1 . We associate this state with accretion from a cold (low-ionised) disc of temperature below ∼ 6500 K. We argue that a transition to such accretion regime should be observed in all X-ray pulsars that have a certain combination of the rotation frequency and magnetic field strength. The proposed model of accretion from a cold disc is able to explain several puzzling observational properties of X-ray pulsars.

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The Hubble Space Telescope observations of X-ray nova MUSCAE 1991 and its spectral evolution

Cited by 38 publications

References 0 publications

The Mass of the Black Hole in the X-Ray Binary Nova Muscae 1991

The Mass of the Black Hole in the X-Ray Binary Nova Muscae 1991

Propeller effect in two brightest transient X-ray pulsars: 4U 0115+63 and V 0332+53

Stable accretion from a cold disc in highly magnetized neutron stars

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