RA Dec
|
ℓ b
|
Location in Globular Cluster | ||
---|---|---|
Type of accretor | NS | Persistent |
Distance [kpc] (other distances) Gaia [kpc] |
1.99±0.02(H), 2.59±0.03(He)
3.3+1.3-2.4 |
Galloway2020 Brandt1992Kuulkers2010 Arnason2021 |
z [kpc] | -0.15 | Galloway2020 |
Orbital period (Porb) [min] | 51.3 | Shahbaz2008 |
Porb determination method | Optical modulation | |
Thermonuclear X-ray burst | Short-B IB SB |
Lewin1976 Kuulkers2010 Kuulkers2005 |
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV) |
1.77E-09 | Lin2018 |
NH [x1022 cm-2] | 0.3 | Madej2010 |
E(B-V) [mag] | ||
Magnitude | V = 18.87±0.08 | Machin1990 |
Proposed companion | CO WD; ONe WD (Optical spectrum; X-ray spectral modelling) |
Nelemans2004Juett2001Madej2010 |
The value reported by Shahbaz2008, corresponding to the strongest periodicity found by the authors, is only suggested as the orbital period. However, Nelemans2006, Hakala2011 and Zhang2012, reassure this value by finding potential periodicities of 48.5, 50 and 48 min, respectively. Madej2013 estimated an orbital period of ~30 min through time-resolved optical spectroscopy. Table 4 in Baglio2014 lists radio and IR fluxes in different bands. Burst oscillations at a frequency of 414.7 Hz (Strohmayer2008). |
UV | Featureless | Madej2013 |
---|---|---|
Optical | CO emission lines N emission lines |
Nelemans2004Madej2013Machin1990 Machin1990 |
X-ray | Ne (0.7 keV) O (0.7 keV) Fe K (6.6 keV) |
Juett2001 Madej2010 Koliopanos2021 |
|
|||
---|---|---|---|
J = 18.12, H = 17.5, K = 17.1, V = 20.0±0.7, K = 17.2±0.3, V = 18.87±0.08, V = 18.5, B = 18.8±0.2 |
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