RA (ICRS) DEC
|
ℓ b
|
Distance [kpc] | 8.0±0.9 | YanesRizo2023 |
---|---|---|
Distance to the plane (z) [kpc] | -0.6±0.1 | YanesRizo2023 |
Orbital period (Porb) [h] | 6.2±0.2 | YanesRizo2023 |
Peak X-ray flux [erg s-1 cm-2] [keV] |
4.66E-08 [2-10] |
Kaluzienski1975 |
Outburst magnitude (AB) | B=17.3 | Murdin1977 |
Quiescent magnitude (AB) | I=21.61±0.09 | Zurita2015YanesRizo2023 |
E(B-V) [mag] | 0.629 | Schlafly2011 |
Strictly speaking it is not a dynamical BH but there is either a robust mass function or mass determination suggesting the presence of a BH
KY TrA showed another outburst in 1990 (Barret1992). It has an interloper with similar brightness 0.64” away with coordinates ICRS α=15:28:16.97 and δ=-61:52:58.52 (YanesRizo2023). There is no formal dynamical solution for the system but YanesRizo2023 derived some dynamical parameters (see below) using the FWHM (Hα) - K2 relation (Casares2015). |
Orbital period [h] | 6.2±0.2 | YanesRizo2023 |
---|---|---|
Star's spectral type | ≥ K2 | YanesRizo2023 |
Star's radial velocity amplitude (K2) [km/s] | 501±52 | YanesRizo2023 |
Mass function 'f(M1)' [M☉] | 3±1 | YanesRizo2023 |
BH mass (M1) [M☉] | 5.8+3.0-2.4 | YanesRizo2023 |
Mass ratio (q=M2/M1) | ≤0.31 | YanesRizo2023 |
Inclination angle (i) [deg] | 57±13 | YanesRizo2023 |
|
|||
---|---|---|---|
B=17.3 | |||
Zurita2015YanesRizo2023 |
|||
V=23.6±0.1 | R=22.4±0.1 | ||
I=21.61±0.09 | |||
Orientation: North up, East left.
Object marked
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Finding chart reference: Zurita2015
BS=14.99 | VS=14.29 |
BT=17.07 | VT=16.36 |
BX=18.44 | VX=17.56 |
BQ=19.44 | VQ=17.86 |