Skip to main content

Ink blot test - what is this light curve

3 posts / 0 new
Last post
LKR's picture
Ink blot test - what is this light curve

Thoughts? Amplitude is about 0.3-0.4 mag.



Sebastian Otero
Sebastian Otero's picture
LSP or Eclipsing binary

Hi Kristine,
I bet the colours of this object puts it in the red giant domain.
From the regularity of the dimming episodes I would classify it as an eclipsing binary but I have seen cases of red giants with Long Secondary Periods (LSP) with light curves reminiscent of eclipses. There doesn't seem to be a clear boundary between the LSPs with the sharpest light curves and the eclipsing binaries. This suggests that dust/disk eclipses might be involved in the LSP scenario, like in RVB stars.

In this particular case I am prone to classify it as an EA-type binary with additional variability coming from the red giant. Do the J-K and B-V support my previous comments?


LKR's picture

J-K = 1.06.

B - V = 1.68

It was a star a student found while looking for SRD's in the ASAS data. My gut was eclipsing binary but it was weird enough to ask around. Thanks!


Log in to post comments
AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484