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V694 Mon (MWC 560) campaign

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weo
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V694 Mon (MWC 560) campaign

AAVSO Alert Notice 538 announces an observing campaign on the symbiotic star V694 Mon (MWC 560), which is in outburst. Photometry and spectroscopy are requested. Please see the Alert Notice for details.

Good observing,

Elizabeth Waagen, AAVSO HQ

jeno
jeno's picture
Thanks for the fast photometry!

Hi folks.  Thanks very much to those who have been obtaining fast photometry of V694 Mon -- the flickering light curves look spectacular!  It is particularly great when more than one observer obtains fast photometry, so that we can be confident that all the little bumps and wiggles in the light curve are real.  The large amplitude of the flickering suggests that the high state is related to a high rate of accretion through the accretion disk.  If the target starts to fade, it will be especially important to determine whether the flickering disappears.

Clear skies,

Jeno

 

lucy
lucy's picture
thanks!

Just echoing Jeno's thanks here---the light curves are looking great and very useful. FYI, the predicted schedule of March 8 (7:17 to 14:14 UT) and March 9 (2:20 to 9:18 UT) are still the most likely times for the Chandra exposures. Data through the rest of March and April will continue to be useful.

Thanks!

lucy
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B band

Also, I'm interested in whether that sudden drop in B band at March 7, 9:00 is real. Some more data from a few observers in that filter would be nice. Thanks! -Adrian

BPO
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V694 Mon

Hi Adrian,

I imaged V694 Mon last night, it was fairly 'quiet', the Blue data ranged between 9.9 - 10.1.

Regards, Douglas.

HBB
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V694 Mon from last night

Here is my data from last night.

 

lucy
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thanks

Many thanks to both of you! Yeah, I don't think that drop was real, the data was withdrawn at some point. All the more reason why multiple observers on the same light curve is useful!

The first Chandra exposure is happening today, not sure when we'll get the data. And Swift's gotten a couple ultraviolet spectra and photometry that we're just starting to look at.

HBB
HBB's picture
Continuing to Monitor V0694 Mon

I am still collecting several hours of data on V0694 Mon on clear nights.  Here is my data from last night.

 

 

 

WGR
WGR's picture
Hello Barbara and all Real

Hello Barbara and all

Real nice light curve.  I too plan to do several hours per clear night on this object.  Here is from 2 nights ago.  I plan to follow this into April.  

Gary

WGR 

 

jeno
jeno's picture
Keeping on

Hi Gary and Barbara and others,

Thanks for your continued attention to this target!  We got some interesting X-ray results, which show that the soft X-rays from either the jet or colliding winds have strengthened quite significantly.  The Swift observations are continuing, and Adrian and I are now going to try to obtain some radio observations as well.

Clear skies,

Jeno 

HBB
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Thanks for the Update

Jeno,

Thanks for the update.  It is nice to hear what is going on with the data we obtain.

 

Barbara

WGR
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Ditto

Hello Jeno

Yes, ditto.  Its good to hear that things are ongoing.  How far into April do you want us to go, or does that depend upon what the resuts are?

 

Gary

B.P.Vietje
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V694 Mon

Hi All,

Joining the party late here.

I started observing this target when the initial notice went out, but haven't continued to follow up.  I got BVRI data on 3/3 and 3/6, which I'm uploading to VPhot now.

If  these look good, shall I share them via VPhot, or do you have an ftp/Dropbox collection for images?

Clear skies,

Brad Vietje, VBPA

Newbury, VT

WGR
WGR's picture
Data to AID-? long to observe

Hello Brad

I would post the data to the AID thru Webobs.  That way its all in one spot.  Jeno can download it from there, and its now in the archive, and all the other observers can also look at it.

Hello Barbara--and all

Unless I hear otherwise, the campaign notice suggested that observations thru April are welcome and useful.  I plan to observer some more, when the weather clears.

Gary

HBB
HBB's picture
V0694 Mon data from April 05 UT

Hi, all,

I had good skies last night.  Here is about 3.5 hours of data.  How much longer do you want us to monitor this star?

Barbara

lucy
lucy's picture
thanks

Hi all- yes, please continue observing (until MWC 560 ceases to be a nighttime object, which will be rather soon)! Sorry for the slow response, I thought I had my account set up to notify me when there was a post here. Interesting results continue to come in---e.g., we just got a detection at 10 GHz with the Very Large Array, signifying at least an order of magnitude increase in radio flux compared to before the outburst in 2014 October.

WGR
WGR's picture
MWC 560 aka V0964 Mon had outburst?

Hello

I was looking at the light curve for ref object, and this campaign was started when MWC 560 was reported in ourburst at mag 8.8 V on JD xxxx7430.  On 7481, (51 days later)  it was reported to be 8.7 Vmag.  Is this another outburst?

WGR

Gary

jeno
jeno's picture
MWC 560's continued high state

Hi Gary.

About MWC 560's recent brightening, I would characterize it as part of the previously reported "outburst".  We don't know how long this outburst, or high state, will last.  If MWC 560 behaves like CH Cyg -- another jet-producing symbiotic star -- it could even last for more than a year!  

As Adrian mentioned, both the radio and soft X-ray flux have increased by more than an order of magnitude in this high state.  Since both radio and soft X-ray emission are thought to be associated with the jet from this binary, it looks like the strength of the outflow has increased.  When MWC 560 does eventually fade in the optical, we will be very interested in seeing what happens to the optical flickering.  

Thanks for your continued attention to this source!

Best,

     Jeno

lucy
lucy's picture
observations closer to -7 deg latitude

I just wanted to thank Rolf Carstens in New Zealand for the data point on May 14. If MWC 560 is up at night for anyone else, photometry continues to be very useful through the end of the month (i.e., the end of our Swift campaign, and probably our last Very Large Array exposure). We might have no further optical measurements from the professionals as of early-May, since the source is too bright in the optical for Swift, yet I increasingly think the optical might be the best probe of the outburst state. So optical magnitudes or spectra through the end of May, no matter how sporadic, would be precious.

hambsch
hambsch's picture
V0694 Mon observations

Hi,

I have started observations with snapshots of V0694 Mon in BVI filters.

Unfortunately the comparison stars in the AAVSO sequence are rather faint compared to the brightness of the star (about 8.2 mag in I, 9.4 in V and 9.8 in B).

Regards,

Josch

lucy
lucy's picture
continued monitoring

Hi folks- PI for the X-ray/radio data here. If MWC 560 = V694 Mon is a nighttime object again for anyone, I'd love some photometry (e.g., V band, but any band observed during the early-2016 outburst is fine). Ideally we'd get to check if there's still flickering, but even just one observation would give us a hint as to whether MWC 560 is still in outburst, help us evaluate whether we should apply for more X-ray time and how important continued AAVSO-monitoring is, and aid in the interpretation of radio data still being taken every 1.5 months through January.

A spectrum of, e.g., H-alpha or H-beta would be nice too to check the status of the outflow.

Thanks!

weo
weo's picture
V694 Mon (MWC 560) campaign modified and continued

AAVSO Special Notice #429 announces the modification to primarily spectroscopy and continuation of the 2016 campaign on the symbiotic variable V694 Mon (MWC 560). Please see the notice for details and observing instructions.

Many thanks, and good observing,

Elizabeth Waagen, AAVSO HQ

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