Columbia University Astronomy and Astrophysics


Optical/IR Candidates for XTE J1829-098
J. P. Halpern & E. V. Gotthelf
ATEL #344 (2004 October 12)

A very bright star in the 2MASS survey should be considered a possible supergiant companion of the transient 7.8 s pulsar XTE J1829-098 (Markwardt et al., ATel #317; Halpern & Gotthelf, ATel #319). At coordinates (J2000) R.A. = 18h29m44.55s, Decl. = -09d51'20.3", this candidate has R>21, I=14.4, J=8.04, H=6.11, K=4.98, where the R and I magnitudes are estimated from digitized UK Schmidt sky-survey plates. Although its coordinates are 8" from the XMM-Newton position of the source (J2000) R.A. = 18h29m44.06s, Decl. = -09d51'23.3" as reported in ATel #319, i.e., twice the nominal X-ray error, allowance could be made for the off-axis location in the X-ray image and absence of other identified sources for astrometric alignment. Alternatively, there is a USNO-B1.0 and 2MASS star at coordinates (J2000) R.A. = 18h29m44.28s, Decl. = -09d51'26.8", which is 5" from the X-ray position. This candidate has B=21.44, R=17.40, I=15.20, J=12.46, H=10.54, K=9.67. IR/optical spectroscopy to classify both of these candidate counterparts should be obtained.

XTE J1829-098 in the XMM-Newton EPIC pn
(J2000) 18 29 44.06, -09 51 23.3
XMM Light Curve


2MASS images (1.8'×1.8')
(J2000) 18 29 44.06, -09 51 23.3
2MASS K 2MASS H 2MASS J

Digitized UK Schmidt I and R Plates (4.3'×4.3')
(J2000) 18 29 44.06, -09 51 23.3
POSS II R POSS II I

MDM 1.3m (2.15'×2.15')
(J2000) 18 29 44.06, -09 51 23.3
MDM 1.3m I MDM 1.3m R

MDM 1.3m I MDM 1.3m R

Infrared Identification of XTE J1829-098
(J2000) 18 29 43.98, -09 51 23.0
MDM 2.4m H
MDM 2.4m H-band (0.9'×0.9')
XMM 3.2" radius circle (black)
Chandra 0.6" radius circle (white)

References

XTE J1829-098, a New 7.8 s Period Pulsar, C.B. Markwardt, J.H. Swank, E.A. Smith, ATel #317 (2004)

XMM-Newton Detection of the 7.8 s Pulsar XTE J1829-098, J.P. Halpern & E.V. Gotthelf, ATel #319 (2004)

Optical/IR Candidates for XTE J1829-098, J.P. Halpern & E.V. Gotthelf, ATel #344 (2004)

X-ray Observations and Infrared Identification of the Transient 7.8 s X-ray Binary Pulsar XTE J1829-098, J. P. Halpern, E. V. Gotthelf, ApJ, 669, 579 (2007)

XTE J1829-098 Predicted for Another Outburst in Early April, C. B. Markwardt, J.P. Halpern, J. H. Swank, ATel #2007 (2009)

XTE XMM-Newton

MDM O
bservatory


Last modified: April 4, 2009