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| Miscellaneous :
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Neguerela et al. 2004 Atel
385: BN0.5II-IIIb supergiant with V=9.64. Leads to D~3.0 kpc |
den Hartog et al. 2004 Atel 281: Orbital period 15.665 days |
Cameron et al. 2004
Atel 312: No radio detection at 4 frequency down to relatively low levels |
Reig et al. 2005 (A&A):
eccentric orbit needed to explain the production of X-rays |
Wen et al. 2006 (ApJS):
Orbital period of 15.670 days with RXTE/ASM |
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den Hartog et al. 2006 (A&A):
- further associates the IGR and Rosat sources.
- the source was detected in 4 occasions by Beppo-SAX. Brightest observation
=>spectral fit with Gamma=2.6
- RXTE ToO => power law shaped spectra with gamma=2.74.
- Comparison between INTEGRAL, Beppo-SAX and RXTE => source is highly
variable from orbit to orbit.
- Nh by RXTE and Beppo-SAX varies from 7e22 to 13e22, while the measured
flux vary from 3e-10erg/s/cm2 (2-20 keV) to 1.8e-11 erg/s/cm2 (3-30 keV).
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in't Zand et al. 2007 (A&A):
- Refinement of orbital period and
ephemeris to
Tmax=53001.7+(I*15.6627)
with RXTE/ASM
- Period in INTEGRAL 20-45 and 45-89 keV folded light curves.
- Spectral analysis performed with PCA and ISGRI=> average spectrum during the flare
shows Nh~9.1 e22 cm-2 and Gamma=2.14 (PCA), while the ISGRI
spectrum is somewhat harder with Gamma=1.84
- Possible detection of a coherent signal
at 359s => associate to the pulsar spin period.
- Pulse period and orbital period=>
wind accretion regime in the Corbet diagram.
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Grunhut et al. (A&A):
- Determination of orbital solution through spectroscopic observations of BD +60 73
optical companion.
- Eccentricity =0.48-0.03+0.02 and mass function
f(M)=0.009 => low mass compact object.
- Spectrum of companion is best matched by B1Ib spectral type
- Not a black hole unless the companion has an exceptionnaly high mass for this
spectral type
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González-Galán et al. 2014 (A&A):
- High resolution spectra at different epoch
- BD +60 73 is a low luminosity sg (BN0.7 Ib) star
- Teff=24 000 K, d~ 3.1 kpc, eccentricity ~ 0.56
- Intermediate supergiant X-ray transient will likely evolve towards persistent Sg binary
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