2021
DOI: 10.48550/arxiv.2111.15145
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Study of the low-amplitude Z Cam star IX Vel

Abstract: IX Vel has been considered as one of the prototypical novalike cataclysmic variables with thermally stable accretion disks. Using All-Sky Automated Survey (ASAS-3) and All-Sky Automated Survey for Supernovae (ASAS-SN) observations, I found that IX Vel is a low-amplitude dwarf nova showing standstills. This object has been re-classified as a Z Cam-type dwarf nova. This conclusion is consistent with the mass-transfer rate using the Gaia parallax which places the object near the lower limit of the thermal stabili… Show more

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Cited by 2 publications
(4 citation statements)
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“…In figure 14, we show the trend of mean magnitudes (averaged in flux) as we did for IX Vel (Kato 2021b) and ST Cha . The result shows that the 2019-2020 standstill was not brighter than the dwarf nova-type states (IW And-type states) before and after this.…”
Section: Are Standstills Brighter Than Dwarf Nova-type States?mentioning
confidence: 96%
See 1 more Smart Citation
“…In figure 14, we show the trend of mean magnitudes (averaged in flux) as we did for IX Vel (Kato 2021b) and ST Cha . The result shows that the 2019-2020 standstill was not brighter than the dwarf nova-type states (IW And-type states) before and after this.…”
Section: Are Standstills Brighter Than Dwarf Nova-type States?mentioning
confidence: 96%
“…The 22.44 d period in apparently referred to these low-amplitude dwarf nova-type variations. Although such low-amplitude dwarf nova-type variations are also seen in IX Vel(Kato 2021b), the cycle length in ASAS J071404+7004.3 is longer compared to IX Vel with 13-20 d and the profile is different in that variations in ASAS J071404+7004.3 tend to have slower rise and steeper decline as seen in the third panel of figure 2. This feature was interpreted as "inside out" (outburst) in.The main reason why reached an inadequate classification was that they only consulted the relatively old literature when referring to IW And stars.…”
mentioning
confidence: 87%
“…The spectra were obtained with slit widths of 1.3 in the UVB arm, 1.2 in the VIS arm, and 1.2 in the NIR arm, using an exposure time of 20 s for each arm. The data were reduced using the Reflex pipeline (Freudling et al 2013) and a telluric correction was performed using molecfit (Smette et al 2015;Kausch et al 2015).…”
Section: X-shootermentioning
confidence: 99%
“…The same light curves were later modelled by Linnell et al (2007), who interpreted the minimum at orbital phase 0.0 as a partial eclipse of the rim of the accretion disc by the secondary. Kato (2021) studied the long-term variability of IX Vel using All-Sky Automated Survey (ASAS-3;Pojmanski 1997) and All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al 2014;Kochanek et al 2017) observations, and found that the data show small amplitude variations similar to dwarf novae outbursts and also standstills, suggesting that IX Vel is a low-amplitude Z Cam star, in other words a dwarf nova alternating between states of outbursting activity and states of high constant brightness (standstills) similar to those in NLs.…”
Section: Introductionmentioning
confidence: 99%