2021MNRAS.501.2522J

2021MNRAS.501.2522J - Mon. Not. R. Astron. Soc., 501, 2522-2530 (2021/February-3)

JI L., DOROSHENKO V., SULEIMANOV V., SANTANGELO A., ORLANDINI M., LIU J., DUCCI L., ZHANG S.N., NABIZADEH A., GAVRAN D., ZHANG S., GE M.Y., LI X.B., TAO L., BU Q.C., QU J.L., LU F.J., CHEN L., SONG L.M., LI T.P., XU Y.P., CAO X.L., CHEN Y., LIU C.Z., CAI C., CHANG Z., CHEN T.X., CHEN Y.P., CUI W.W., DU Y.Y., GAO G.H., GAO H., GU Y.D., GUAN J., GUO C.C., HAN D.W., HUANG Y., HUO J., JIA S.M., JIANG W.C., JIN J., KONG L.D., LI B., LI C.K., LI G., LI W., LI X., LI X.F., LI Z.W., LIANG X.H., LIAO J.Y., LIU B.S., LIU H.X., LIU H.W., LIU X.J., LU X.F., LUO Q., LUO T., MA R.C., MA X., MENG B., NANG Y., NIE J.Y., OU G., REN X.Q., SAI N., SONG X.Y., SUN L., TAN Y., TUO Y.L., WANG C., WANG L.J., WANG P.J., WANG W.S., WANG Y.S., WEN X.Y., WU B.Y., WU B.B., WU M., XIAO G.C., XIAO S., XIONG S.L., YANG R.J., YANG S., YANG Y.-J., YANG Y.-J., YI Q.B., YIN Q.Q., YOU Y., ZHANG F., ZHANG H.M., ZHANG J., ZHANG P., ZHANG W., ZHANG W.C., ZHANG Y., ZHANG Y.F., ZHANG Y.H., ZHAO H.S., ZHAO X.F., ZHENG S.J., ZHENG Y.G. and ZHOU D.K.

We investigate the absorption and emission features in observations of GX 301-2 detected with Insight-HXMT/LE in 2017-2019. At different orbital phases, we found prominent Fe Kα, Kβ, and Ni Kα lines, as well as Compton shoulders and Fe K-shell absorption edges. These features are due to the X-ray reprocessing caused by the interaction between the radiation from the source and surrounding accretion material. According to the ratio of iron lines (Kα and Kβ), we infer the accretion material is in a low ionization state. We find an orbital-dependent local absorption column density, which has a large value and strong variability around the periastron. We explain its variability as a result of inhomogeneities of the accretion environment and/or instabilities of accretion processes. In addition, the variable local column density is correlated with the equivalent width of the iron Kα lines throughout the orbit, which suggests that the accretion material near the neutron star is spherically distributed.

Journal keyword(s): stars: neutron - X-rays: binaries - X-rays: individual: GX 301-2

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	V* BP Cru	HXB	12 26 37.5605188992	-62 46 13.261044684		12.482	10.803	10.304		B1Ia+	731	0

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`4U 1223-624`	`INTREF 497`	`SWIFT J122637.3-624610`	`WISE J122637.57-624613.2`
`3A 1223-624`	`1M 1223-624`	`1SXPS J122637.1-624610`	`WRAY 15-977`
`2CXO J122637.5-624613`	`2MASS J12263756-6246132`	`2SXPS J122637.2-624613`	`1XRS 12238-624`
`GPS 1222-625`	`MO 1-3`	`TIC 450572050`	`[BM83] X1223-624`
`GSC 08979-01108`	`MSX6C G300.0980-00.0351`	`TYC 8979-1108-1`	`[GM76] 40`
`GX 301-02`	`PBC J1226.6-6246`	`2U 1223-62`	`[KRL2007b] 116`
`GX 301+00`	`2S 1223-624`	`3U 1223-62`	`AAVSO 1221-62`
`GX 301-00.2`	`SBC9 724`	`4U 1223-62`	`Gaia DR3 6054569565614460800`
`1H 1221-623`	`SRGA J122637.1-624613`	`UCAC2 4126327`	`Gaia DR1 6054569561285282304`
`Hen 3-788`	`SSTGLMC G300.0981-00.0352`	`UCAC4 137-083467`	`Gaia DR2 6054569565614460800`
`H 1223-624`	`SWIFT J1226.6-6244`	*`V BP Cru`**
`INTEGRAL1 10`	`SWIFT J1226.6-6246`	`WEB 10801`

`GSC 08979-01108`	`2MASS J12263756-6246132`	`MSX6C G300.0980-00.0351`	`SSTGLMC G300.0981-00.0352`	`TYC 8979-1108-1`
`UCAC2 4126327`	`UCAC4 137-083467`	*`V BP Cru`**	`WISE J122637.57-624613.2`	`Gaia DR3 6054569565614460800`
`Gaia DR1 6054569561285282304`	`Gaia DR2 6054569565614460800`